TY  - JOUR
AU  - Cvetković, Slobodan M.
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Grbović-Novaković, Jasmina
AU  - Kovačević, Vlado
AU  - Lopičić, Zorica
AU  - Adamović, Vladimir
AU  - Kijevčanin, Mirjana Lj.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10300
AB  - Renewable hydrogen produced from the waste streams can be a good option for clean energy production and reduction of greenhouse gases emissions into the environment. In this study, the potential for hydrogen production from the food industry wastewaters in Serbia and the further use of the calculated potentials were investigated. This was performed through two technological routes including the biogas steam reforming process and the electrolysis after biogas cogeneration process. Furthermore, the environmental impacts of these processes were considered. The total hydrogen potential via the biogas steam reforming process was 4094.70 tons, while the total hydrogen potential via the electrolysis after biogas cogeneration process was 1751.08 tons. These potentials can be used for direct energy production in the food industry, electricity production for the national electric grid, transport, injection in the natural gas grid and/or as a resource in the chemical industry. Regarding the Greenhouse Gas emissions reduction, hydrogen production by both routes represents a promising pathway. The results of this work can serve the decision makers to plan hydrogen application in the energy sector of the Republic of Serbia defining supporting measures for its application. Also, the presented analysis is enforceable in the Western Balkan countries for the application of hydrogen as an energy source in their systems for energy production, transport and economy.
T2  - Journal of Cleaner Production
T1  - Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters
VL  - 363
SP  - 132142
DO  - 10.1016/j.jclepro.2022.132142
ER  - 

@article{
author = "Cvetković, Slobodan M. and Kaluđerović-Radoičić, Tatjana and Grbović-Novaković, Jasmina and Kovačević, Vlado and Lopičić, Zorica and Adamović, Vladimir and Kijevčanin, Mirjana Lj.",
year = "2022",
abstract = "Renewable hydrogen produced from the waste streams can be a good option for clean energy production and reduction of greenhouse gases emissions into the environment. In this study, the potential for hydrogen production from the food industry wastewaters in Serbia and the further use of the calculated potentials were investigated. This was performed through two technological routes including the biogas steam reforming process and the electrolysis after biogas cogeneration process. Furthermore, the environmental impacts of these processes were considered. The total hydrogen potential via the biogas steam reforming process was 4094.70 tons, while the total hydrogen potential via the electrolysis after biogas cogeneration process was 1751.08 tons. These potentials can be used for direct energy production in the food industry, electricity production for the national electric grid, transport, injection in the natural gas grid and/or as a resource in the chemical industry. Regarding the Greenhouse Gas emissions reduction, hydrogen production by both routes represents a promising pathway. The results of this work can serve the decision makers to plan hydrogen application in the energy sector of the Republic of Serbia defining supporting measures for its application. Also, the presented analysis is enforceable in the Western Balkan countries for the application of hydrogen as an energy source in their systems for energy production, transport and economy.",
journal = "Journal of Cleaner Production",
title = "Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters",
volume = "363",
pages = "132142",
doi = "10.1016/j.jclepro.2022.132142"
}

Cvetković, S. M., Kaluđerović-Radoičić, T., Grbović-Novaković, J., Kovačević, V., Lopičić, Z., Adamović, V.,& Kijevčanin, M. Lj.. (2022). Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters. in Journal of Cleaner Production, 363, 132142.
https://doi.org/10.1016/j.jclepro.2022.132142

Cvetković SM, Kaluđerović-Radoičić T, Grbović-Novaković J, Kovačević V, Lopičić Z, Adamović V, Kijevčanin ML. Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters. in Journal of Cleaner Production. 2022;363:132142.
doi:10.1016/j.jclepro.2022.132142 .

Cvetković, Slobodan M., Kaluđerović-Radoičić, Tatjana, Grbović-Novaković, Jasmina, Kovačević, Vlado, Lopičić, Zorica, Adamović, Vladimir, Kijevčanin, Mirjana Lj., "Renewable hydrogen production perspective in Serbia via biogas generated from food processing wastewaters" in Journal of Cleaner Production, 363 (2022):132142,
https://doi.org/10.1016/j.jclepro.2022.132142 . .

TY  - JOUR
AU  - Cvetković, Slobodan M.
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Kijevčanin, Mirjana Lj.
AU  - Grbović-Novaković, Jasmina
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9128
AB  - The aim of this paper is to demonstrate and to quantify energy flows in a life cycle of biogas to biohydrogen production, starting from feedstock materials via anaerobic digestion, biogas upgrading, biohydrogen production, to the end of biogas system (application of digestate as fertilizer in agriculture). The performance of the biogas plant of Mirotin dairy farm in Serbia has been assessed. According to Life Cycle Energy Assessment approach, results obtained in this study have shown that biohydrogen production via biogas steam reforming has negative energy balance (with −16,837 GJ). It has also been demonstrated that this process is energy unsustainable in an environmental context. In future analysis it would be necessary to consider the other aspects of sustainability, e.g. the economical and social factors in order to estimate the overall sustainability of the biogas utilization pathways, especially having in mind that the technology of converting biogas to hydrogen is still in the development phase. © 2021 Hydrogen Energy Publications LLC
T2  - International Journal of Hydrogen Energy
T1  - Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia
VL  - 46
IS  - 27
SP  - 14130
EP  - 14137
DO  - 10.1016/j.ijhydene.2021.01.181
ER  - 

@article{
author = "Cvetković, Slobodan M. and Kaluđerović-Radoičić, Tatjana and Kijevčanin, Mirjana Lj. and Grbović-Novaković, Jasmina",
year = "2021",
abstract = "The aim of this paper is to demonstrate and to quantify energy flows in a life cycle of biogas to biohydrogen production, starting from feedstock materials via anaerobic digestion, biogas upgrading, biohydrogen production, to the end of biogas system (application of digestate as fertilizer in agriculture). The performance of the biogas plant of Mirotin dairy farm in Serbia has been assessed. According to Life Cycle Energy Assessment approach, results obtained in this study have shown that biohydrogen production via biogas steam reforming has negative energy balance (with −16,837 GJ). It has also been demonstrated that this process is energy unsustainable in an environmental context. In future analysis it would be necessary to consider the other aspects of sustainability, e.g. the economical and social factors in order to estimate the overall sustainability of the biogas utilization pathways, especially having in mind that the technology of converting biogas to hydrogen is still in the development phase. © 2021 Hydrogen Energy Publications LLC",
journal = "International Journal of Hydrogen Energy",
title = "Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia",
volume = "46",
number = "27",
pages = "14130-14137",
doi = "10.1016/j.ijhydene.2021.01.181"
}

Cvetković, S. M., Kaluđerović-Radoičić, T., Kijevčanin, M. Lj.,& Grbović-Novaković, J.. (2021). Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia. in International Journal of Hydrogen Energy, 46(27), 14130-14137.
https://doi.org/10.1016/j.ijhydene.2021.01.181

Cvetković SM, Kaluđerović-Radoičić T, Kijevčanin ML, Grbović-Novaković J. Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia. in International Journal of Hydrogen Energy. 2021;46(27):14130-14137.
doi:10.1016/j.ijhydene.2021.01.181 .

Cvetković, Slobodan M., Kaluđerović-Radoičić, Tatjana, Kijevčanin, Mirjana Lj., Grbović-Novaković, Jasmina, "Life Cycle Energy Assessment of biohydrogen production via biogas steam reforming: Case study of biogas plant on a farm in Serbia" in International Journal of Hydrogen Energy, 46, no. 27 (2021):14130-14137,
https://doi.org/10.1016/j.ijhydene.2021.01.181 . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Raičević, Slavica
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4025
AB  - Natural apatites represent a cost effective soil amendment, which can be used for in situ reduction of lead bioavailability and mobility. In our previous work, we selected Lisina apatite (LA) as a promising natural mineral for lead immobilization based on theoretical predictions. This study investigated the adsorption equilibrium and kinetics of aqueous Pb sorption onto Lisina apatite and synthetic hydroxyapatite (HAP) at different temperatures. XRD analysis indicated that LA consists of three minerals: fluorapatite, quartz and muscovite. After reaction with a Pb solution, only FA peaks were changed, confirming that fluorapatite present in LA is responsible for Pb sorption. Sorption experiments confirmed that both LA and HAP are effective in Pb removal. Langmuir, Freundlich, Temkin, Koble-Corrigan and Redlich-Peterson isotherm models were applied to experimental data. The kinetics of the sorption process on both minerals was well characterized by the pseudo-second order reaction rate. Results indicate that Pb immobilization by HAP is a two-step process: the first rapid phase, possibly surface complexation and secondary dissolution of HAP and precipitation of pyromorphite. The sorption of Pb by Lisina apatite is also a two-step process, but the reaction mechanisms are more complicated and need further research as the results indicate that different mechanisms dominate at different temperatures. The values of thermodynamic equilibrium constants and Gibbs free energy were also calculated. The values of AG obtained confirm the feasibility of both HAP and LA as effective sorbents of the Pb ion. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Chemical Engineering Journal
T1  - Aqueous Pb sorption by synthetic and natural apatite: Kinetics, equilibrium and thermodynamic studies
VL  - 160
IS  - 2
SP  - 503
EP  - 510
DO  - 10.1016/j.cej.2010.03.061
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Raičević, Slavica",
year = "2010",
abstract = "Natural apatites represent a cost effective soil amendment, which can be used for in situ reduction of lead bioavailability and mobility. In our previous work, we selected Lisina apatite (LA) as a promising natural mineral for lead immobilization based on theoretical predictions. This study investigated the adsorption equilibrium and kinetics of aqueous Pb sorption onto Lisina apatite and synthetic hydroxyapatite (HAP) at different temperatures. XRD analysis indicated that LA consists of three minerals: fluorapatite, quartz and muscovite. After reaction with a Pb solution, only FA peaks were changed, confirming that fluorapatite present in LA is responsible for Pb sorption. Sorption experiments confirmed that both LA and HAP are effective in Pb removal. Langmuir, Freundlich, Temkin, Koble-Corrigan and Redlich-Peterson isotherm models were applied to experimental data. The kinetics of the sorption process on both minerals was well characterized by the pseudo-second order reaction rate. Results indicate that Pb immobilization by HAP is a two-step process: the first rapid phase, possibly surface complexation and secondary dissolution of HAP and precipitation of pyromorphite. The sorption of Pb by Lisina apatite is also a two-step process, but the reaction mechanisms are more complicated and need further research as the results indicate that different mechanisms dominate at different temperatures. The values of thermodynamic equilibrium constants and Gibbs free energy were also calculated. The values of AG obtained confirm the feasibility of both HAP and LA as effective sorbents of the Pb ion. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Chemical Engineering Journal",
title = "Aqueous Pb sorption by synthetic and natural apatite: Kinetics, equilibrium and thermodynamic studies",
volume = "160",
number = "2",
pages = "503-510",
doi = "10.1016/j.cej.2010.03.061"
}

Kaluđerović-Radoičić, T.,& Raičević, S.. (2010). Aqueous Pb sorption by synthetic and natural apatite: Kinetics, equilibrium and thermodynamic studies. in Chemical Engineering Journal, 160(2), 503-510.
https://doi.org/10.1016/j.cej.2010.03.061

Kaluđerović-Radoičić T, Raičević S. Aqueous Pb sorption by synthetic and natural apatite: Kinetics, equilibrium and thermodynamic studies. in Chemical Engineering Journal. 2010;160(2):503-510.
doi:10.1016/j.cej.2010.03.061 .

Kaluđerović-Radoičić, Tatjana, Raičević, Slavica, "Aqueous Pb sorption by synthetic and natural apatite: Kinetics, equilibrium and thermodynamic studies" in Chemical Engineering Journal, 160, no. 2 (2010):503-510,
https://doi.org/10.1016/j.cej.2010.03.061 . .

TY  - JOUR
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Raičević, Slavica
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3614
AB  - In this work, mineral apatite was investigated for the remediation of lead contamination. Two different apatite minerals were used: synthetic apatite, Ca(10)(PO(4))(6)(OH)(2) (hereafter denoted as HAP) and natural apatite from Lisina, near Bosilegrad, Serbia (hereafter denoted as LA). Phosphate ore from Lisina deposit consists of 43.3 % apatite In the form of fluorapatite, Ca(10)(PO(4))(6)(F)(2). Sorption properties of HAP and LA were Investigated The results show that both of these minerals are effective in lead removal from the water solution. Sorption capacity of HAP obtained In this experiment is 0.216 mmol Pb/g HAP, while the value for LA is 0.162 mmol Pb/g LA. Modeling of these systems, was conducted using Visual Minteq computer program The values obtained from the computer simulation were compared to experimental values.
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - In Situ Lead Stabilization Using Natural and Synthetic Apatite
VL  - 14
IS  - 4
SP  - 269
EP  - 271
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3614
ER  - 

@article{
author = "Kaluđerović-Radoičić, Tatjana and Raičević, Slavica",
year = "2008",
abstract = "In this work, mineral apatite was investigated for the remediation of lead contamination. Two different apatite minerals were used: synthetic apatite, Ca(10)(PO(4))(6)(OH)(2) (hereafter denoted as HAP) and natural apatite from Lisina, near Bosilegrad, Serbia (hereafter denoted as LA). Phosphate ore from Lisina deposit consists of 43.3 % apatite In the form of fluorapatite, Ca(10)(PO(4))(6)(F)(2). Sorption properties of HAP and LA were Investigated The results show that both of these minerals are effective in lead removal from the water solution. Sorption capacity of HAP obtained In this experiment is 0.216 mmol Pb/g HAP, while the value for LA is 0.162 mmol Pb/g LA. Modeling of these systems, was conducted using Visual Minteq computer program The values obtained from the computer simulation were compared to experimental values.",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "In Situ Lead Stabilization Using Natural and Synthetic Apatite",
volume = "14",
number = "4",
pages = "269-271",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3614"
}

Kaluđerović-Radoičić, T.,& Raičević, S.. (2008). In Situ Lead Stabilization Using Natural and Synthetic Apatite. in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 14(4), 269-271.
https://hdl.handle.net/21.15107/rcub_vinar_3614

Kaluđerović-Radoičić T, Raičević S. In Situ Lead Stabilization Using Natural and Synthetic Apatite. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2008;14(4):269-271.
https://hdl.handle.net/21.15107/rcub_vinar_3614 .

Kaluđerović-Radoičić, Tatjana, Raičević, Slavica, "In Situ Lead Stabilization Using Natural and Synthetic Apatite" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 14, no. 4 (2008):269-271,
https://hdl.handle.net/21.15107/rcub_vinar_3614 .

TY  - CONF
AU  - Raičević, Slavica
AU  - Stanić, Vojislav
AU  - Kaluđerović-Radoičić, Tatjana
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6679
AB  - Several approaches for immobilization of arsenic (As) based on the transformation of its soluble forms (compounds) into highly insoluble arsenate apatite Ca-5(AsO4)(3)OH have been proposed. These immobilization techniques are successfully applied in treatment of industrial waste containing As. Quite the contrary, treatment of soil contaminated with As by apatite amendments, instead of immobilization of this toxic element, increases its mobility and bioavailability. The mechanism underlying these opposite effects still remains elusive. Here, the stability analysis of different calcium arsenates: Ca-5(AsO4)(3)OH, Ca-4(AsO4)(2)(OH)(2), Ca-3(AsO4)(2) Ca5H2(AsO4)(2) and CaHASO(4) was performed, which is based on the calculation of the ion-ion interaction potential (IIIP). It has been demonstrated earlier that HIP, representing the main term of the cohesive energy, is a suitable parameter for assessment of mineral stability. According to the results of this analysis, arsenate apatite with IIIP value of -0.578 Ry represents the most stable chemical form among analyzed compounds. Based on this finding, we proposed a mechanism of formation of arsenate apatite in the presence of hydroxyapatite. This mechanism can explain the suitability of this approach for the treatment of industrial waste and its limitations for in situ treatment of soil and water contaminated with As.
C3  - Materials Science Forum
T1  - Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste
VL  - 555
SP  - 131
EP  - +
UR  - https://hdl.handle.net/21.15107/rcub_vinar_6679
ER  - 

@conference{
author = "Raičević, Slavica and Stanić, Vojislav and Kaluđerović-Radoičić, Tatjana",
year = "2007",
abstract = "Several approaches for immobilization of arsenic (As) based on the transformation of its soluble forms (compounds) into highly insoluble arsenate apatite Ca-5(AsO4)(3)OH have been proposed. These immobilization techniques are successfully applied in treatment of industrial waste containing As. Quite the contrary, treatment of soil contaminated with As by apatite amendments, instead of immobilization of this toxic element, increases its mobility and bioavailability. The mechanism underlying these opposite effects still remains elusive. Here, the stability analysis of different calcium arsenates: Ca-5(AsO4)(3)OH, Ca-4(AsO4)(2)(OH)(2), Ca-3(AsO4)(2) Ca5H2(AsO4)(2) and CaHASO(4) was performed, which is based on the calculation of the ion-ion interaction potential (IIIP). It has been demonstrated earlier that HIP, representing the main term of the cohesive energy, is a suitable parameter for assessment of mineral stability. According to the results of this analysis, arsenate apatite with IIIP value of -0.578 Ry represents the most stable chemical form among analyzed compounds. Based on this finding, we proposed a mechanism of formation of arsenate apatite in the presence of hydroxyapatite. This mechanism can explain the suitability of this approach for the treatment of industrial waste and its limitations for in situ treatment of soil and water contaminated with As.",
journal = "Materials Science Forum",
title = "Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste",
volume = "555",
pages = "131-+",
url = "https://hdl.handle.net/21.15107/rcub_vinar_6679"
}

Raičević, S., Stanić, V.,& Kaluđerović-Radoičić, T.. (2007). Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste. in Materials Science Forum, 555, 131-+.
https://hdl.handle.net/21.15107/rcub_vinar_6679

Raičević S, Stanić V, Kaluđerović-Radoičić T. Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste. in Materials Science Forum. 2007;555:131-+.
https://hdl.handle.net/21.15107/rcub_vinar_6679 .

Raičević, Slavica, Stanić, Vojislav, Kaluđerović-Radoičić, Tatjana, "Theoretical assessment of calcium arsenates stability:Application in the treatment of arsenic contaminated waste" in Materials Science Forum, 555 (2007):131-+,
https://hdl.handle.net/21.15107/rcub_vinar_6679 .

TY  - JOUR
AU  - Raičević, Slavica
AU  - Kaluđerović-Radoičić, Tatjana
AU  - Zouboulis, AI
PY  - 2005
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/2843
AB  - The in situ (in place) immobilization of toxic metals, using inexpensive reactive amendments, is considered as a simple and cost-effective approach for the treatment of soils, contaminated by the presence of heavy metals, when these soils are difficult or costly to be removed and treated ex situ. Several application studies have demonstrated that the stabilization of contaminated soils and groundwaters by the addition of apatite minerals has the potential to be a successful and widely applicable remediation strategy for the case of Pb, Cd, as well as for other toxic metals, existing in polluted soils. On the other hand, the specific immobilization mechanism(s) of these toxic metals remains rather elusive. The present work involves an interdisciplinary theoretical and experimental approach, designed to gain at the fundamental (molecular) level the understanding of respective mechanisms, considering the immobilization of Pb and Cd by the addition of apatites. The theoretical analysis of stability, regarding the apatite/Pb or apatite/Cd systems and the relevant results of sorption experiments, pointed out two different mechanisms for the immobilization of Pb or Cd by the use of apatites. The possible practical consequences of these findings for the selection/application of natural apatites for the remediation of contaminated soils by the presence of heavy metals have been also discussed. (C) 2004 Elsevier B.V. All rights reserved.
T2  - Journal of Hazardous Materials
T1  - In situ stabilization of toxic metals in polluted soils using phosphates: theoretical prediction and experimental verification
VL  - 117
IS  - 1
SP  - 41
EP  - 53
DO  - 10.1016/j.jhazmat.2004.07.024
ER  - 

@article{
author = "Raičević, Slavica and Kaluđerović-Radoičić, Tatjana and Zouboulis, AI",
year = "2005",
abstract = "The in situ (in place) immobilization of toxic metals, using inexpensive reactive amendments, is considered as a simple and cost-effective approach for the treatment of soils, contaminated by the presence of heavy metals, when these soils are difficult or costly to be removed and treated ex situ. Several application studies have demonstrated that the stabilization of contaminated soils and groundwaters by the addition of apatite minerals has the potential to be a successful and widely applicable remediation strategy for the case of Pb, Cd, as well as for other toxic metals, existing in polluted soils. On the other hand, the specific immobilization mechanism(s) of these toxic metals remains rather elusive. The present work involves an interdisciplinary theoretical and experimental approach, designed to gain at the fundamental (molecular) level the understanding of respective mechanisms, considering the immobilization of Pb and Cd by the addition of apatites. The theoretical analysis of stability, regarding the apatite/Pb or apatite/Cd systems and the relevant results of sorption experiments, pointed out two different mechanisms for the immobilization of Pb or Cd by the use of apatites. The possible practical consequences of these findings for the selection/application of natural apatites for the remediation of contaminated soils by the presence of heavy metals have been also discussed. (C) 2004 Elsevier B.V. All rights reserved.",
journal = "Journal of Hazardous Materials",
title = "In situ stabilization of toxic metals in polluted soils using phosphates: theoretical prediction and experimental verification",
volume = "117",
number = "1",
pages = "41-53",
doi = "10.1016/j.jhazmat.2004.07.024"
}

Raičević, S., Kaluđerović-Radoičić, T.,& Zouboulis, A.. (2005). In situ stabilization of toxic metals in polluted soils using phosphates: theoretical prediction and experimental verification. in Journal of Hazardous Materials, 117(1), 41-53.
https://doi.org/10.1016/j.jhazmat.2004.07.024

Raičević S, Kaluđerović-Radoičić T, Zouboulis A. In situ stabilization of toxic metals in polluted soils using phosphates: theoretical prediction and experimental verification. in Journal of Hazardous Materials. 2005;117(1):41-53.
doi:10.1016/j.jhazmat.2004.07.024 .

Raičević, Slavica, Kaluđerović-Radoičić, Tatjana, Zouboulis, AI, "In situ stabilization of toxic metals in polluted soils using phosphates: theoretical prediction and experimental verification" in Journal of Hazardous Materials, 117, no. 1 (2005):41-53,
https://doi.org/10.1016/j.jhazmat.2004.07.024 . .