TY  - JOUR
AU  - Trtica, Milan
AU  - Stašić, Jelena
AU  - Limpouch, Jiri
AU  - Gavrilov, Peter T.
AU  - Chen, X.
AU  - Ciganović, Jovan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8608
AB  - The behavior of 16Cr3Al ODS steel (oxide dispersion strengthened steel), widely employed structural fusion material, under high-intensity laser radiation with intensity up to 10(14)W/cm(2) was investigated in air, helium and vacuum surrounding. Employed system was 65 fs laser at 804 nm, with applied pulse energy up to 5.25 mJ. Morphological effects were studied - cracking, crater parameters (depth, cross-section), LIPSS (laser-induced periodic surface structures) formation at the crater periphery, hydrodynamic effects, as well as chemical variations on the surface. Ablation thresholds were also determined for all three ambiences (for 100 applied pulses), and they were 0.30 J/cm(2), 0.23 J/cm(2) and 0.39 J/cm(2) in air, helium and vacuum, respectively. Plasma occurred in all experiments and it was most prominent in vacuum due to strongest laser-material coupling.
T2  - Fusion Engineering and Design
T1  - Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum
VL  - 150
SP  - 111360
DO  - 10.1016/j.fusengdes.2019.111360
ER  - 

@article{
author = "Trtica, Milan and Stašić, Jelena and Limpouch, Jiri and Gavrilov, Peter T. and Chen, X. and Ciganović, Jovan",
year = "2020",
abstract = "The behavior of 16Cr3Al ODS steel (oxide dispersion strengthened steel), widely employed structural fusion material, under high-intensity laser radiation with intensity up to 10(14)W/cm(2) was investigated in air, helium and vacuum surrounding. Employed system was 65 fs laser at 804 nm, with applied pulse energy up to 5.25 mJ. Morphological effects were studied - cracking, crater parameters (depth, cross-section), LIPSS (laser-induced periodic surface structures) formation at the crater periphery, hydrodynamic effects, as well as chemical variations on the surface. Ablation thresholds were also determined for all three ambiences (for 100 applied pulses), and they were 0.30 J/cm(2), 0.23 J/cm(2) and 0.39 J/cm(2) in air, helium and vacuum, respectively. Plasma occurred in all experiments and it was most prominent in vacuum due to strongest laser-material coupling.",
journal = "Fusion Engineering and Design",
title = "Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum",
volume = "150",
pages = "111360",
doi = "10.1016/j.fusengdes.2019.111360"
}

Trtica, M., Stašić, J., Limpouch, J., Gavrilov, P. T., Chen, X.,& Ciganović, J.. (2020). Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum. in Fusion Engineering and Design, 150, 111360.
https://doi.org/10.1016/j.fusengdes.2019.111360

Trtica M, Stašić J, Limpouch J, Gavrilov PT, Chen X, Ciganović J. Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum. in Fusion Engineering and Design. 2020;150:111360.
doi:10.1016/j.fusengdes.2019.111360 .

Trtica, Milan, Stašić, Jelena, Limpouch, Jiri, Gavrilov, Peter T., Chen, X., Ciganović, Jovan, "Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum" in Fusion Engineering and Design, 150 (2020):111360,
https://doi.org/10.1016/j.fusengdes.2019.111360 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Limpouch, Jiri
AU  - Stašić, Jelena
AU  - Gavrilov, Peter T.
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0169433218324929
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7871
AB  - The present study deals with modification of tungsten surface with high-intensity (∼1015 W/cm2) femtosecond laser in air and vacuum surrounding. Specific findings include: (a) the applied intensities produce crater-like damages with depth ∼31.0 μm in vacuum and ∼7.2 μm in air; (b) peripheral region of the damages is diffuse in air atmosphere unlike vacuum where it is more sharply defined; (c) hydrodynamic features, while present in vacuum, are dramatically reduced in air; (d) characteristic chemical surface changes occur at the surface, and (e) plasma forms in front of the target in both surroundings. The obtained results imply that the employed intensities, in a certain sense, can be used for simulation of some processes in the fusion reactor and for highly precise material removal and tungsten surface processing (by fine tuning of given fs laser parameters). © 2018 Elsevier B.V.
T2  - Applied Surface Science
T1  - Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience
VL  - 464
SP  - 99
EP  - 107
DO  - 10.1016/j.apsusc.2018.09.074
ER  - 

@article{
author = "Trtica, Milan and Limpouch, Jiri and Stašić, Jelena and Gavrilov, Peter T.",
year = "2019",
abstract = "The present study deals with modification of tungsten surface with high-intensity (∼1015 W/cm2) femtosecond laser in air and vacuum surrounding. Specific findings include: (a) the applied intensities produce crater-like damages with depth ∼31.0 μm in vacuum and ∼7.2 μm in air; (b) peripheral region of the damages is diffuse in air atmosphere unlike vacuum where it is more sharply defined; (c) hydrodynamic features, while present in vacuum, are dramatically reduced in air; (d) characteristic chemical surface changes occur at the surface, and (e) plasma forms in front of the target in both surroundings. The obtained results imply that the employed intensities, in a certain sense, can be used for simulation of some processes in the fusion reactor and for highly precise material removal and tungsten surface processing (by fine tuning of given fs laser parameters). © 2018 Elsevier B.V.",
journal = "Applied Surface Science",
title = "Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience",
volume = "464",
pages = "99-107",
doi = "10.1016/j.apsusc.2018.09.074"
}

Trtica, M., Limpouch, J., Stašić, J.,& Gavrilov, P. T.. (2019). Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience. in Applied Surface Science, 464, 99-107.
https://doi.org/10.1016/j.apsusc.2018.09.074

Trtica M, Limpouch J, Stašić J, Gavrilov PT. Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience. in Applied Surface Science. 2019;464:99-107.
doi:10.1016/j.apsusc.2018.09.074 .

Trtica, Milan, Limpouch, Jiri, Stašić, Jelena, Gavrilov, Peter T., "Femtosecond laser-assisted surface modification of tungsten with 1015 W/cm2 intensity in air and vacuum ambience" in Applied Surface Science, 464 (2019):99-107,
https://doi.org/10.1016/j.apsusc.2018.09.074 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Limpouch, Jiri
AU  - Gavrilov, Peter T.
AU  - Hribek, P.
AU  - Stašić, Jelena
AU  - Branković, Goran O.
AU  - Chen, X.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1713
AB  - A study of ASP 30 steel surface modification with high intensity Ti:sapphire laser, operating at 804 nm wavelength and pulse duration of 60 fs, in vacuum ambient, is presented. ASP 30 steel surface variations were studied at laser intensities of 10(14) and 10(13) W/cm(2). The steel target specific surface changes and phenomena observed are: (i) Creation of craters at 10(14) W/cm(2) intensity; (ii) formation of periodic surface structures only at the reduced intensity of 10(13) W/cm(2); (iii) chemical surface changes registered only at higher laser intensity, and (iv) occurrence of plasma in front of the surface, including its emission in X-ray region. It can be concluded from this study that the reported laser intensities can effectively be applied for ASP 30 steel surface modification. Careful choosing of laser intensity and pulse count can lead to precise superficial material removal, for example laser intensity similar to 10(13) W/cm(2) and low pulse count can lead to ultra-precise surface processing. Generally, femtosecond laser surface modification of ASP 30 steel is non-contact and very rapid compared with traditional modification methods.
T2  - Laser and Particle Beams
T1  - Surface modification of ASP 30 steel induced by femtosecond laser with 10(14) and 10(13) W/cm(2) intensity in vacuum
VL  - 35
IS  - 3
SP  - 534
EP  - 542
DO  - 10.1017/S0263034617000337
ER  - 

@article{
author = "Trtica, Milan and Limpouch, Jiri and Gavrilov, Peter T. and Hribek, P. and Stašić, Jelena and Branković, Goran O. and Chen, X.",
year = "2017",
abstract = "A study of ASP 30 steel surface modification with high intensity Ti:sapphire laser, operating at 804 nm wavelength and pulse duration of 60 fs, in vacuum ambient, is presented. ASP 30 steel surface variations were studied at laser intensities of 10(14) and 10(13) W/cm(2). The steel target specific surface changes and phenomena observed are: (i) Creation of craters at 10(14) W/cm(2) intensity; (ii) formation of periodic surface structures only at the reduced intensity of 10(13) W/cm(2); (iii) chemical surface changes registered only at higher laser intensity, and (iv) occurrence of plasma in front of the surface, including its emission in X-ray region. It can be concluded from this study that the reported laser intensities can effectively be applied for ASP 30 steel surface modification. Careful choosing of laser intensity and pulse count can lead to precise superficial material removal, for example laser intensity similar to 10(13) W/cm(2) and low pulse count can lead to ultra-precise surface processing. Generally, femtosecond laser surface modification of ASP 30 steel is non-contact and very rapid compared with traditional modification methods.",
journal = "Laser and Particle Beams",
title = "Surface modification of ASP 30 steel induced by femtosecond laser with 10(14) and 10(13) W/cm(2) intensity in vacuum",
volume = "35",
number = "3",
pages = "534-542",
doi = "10.1017/S0263034617000337"
}

Trtica, M., Limpouch, J., Gavrilov, P. T., Hribek, P., Stašić, J., Branković, G. O.,& Chen, X.. (2017). Surface modification of ASP 30 steel induced by femtosecond laser with 10(14) and 10(13) W/cm(2) intensity in vacuum. in Laser and Particle Beams, 35(3), 534-542.
https://doi.org/10.1017/S0263034617000337

Trtica M, Limpouch J, Gavrilov PT, Hribek P, Stašić J, Branković GO, Chen X. Surface modification of ASP 30 steel induced by femtosecond laser with 10(14) and 10(13) W/cm(2) intensity in vacuum. in Laser and Particle Beams. 2017;35(3):534-542.
doi:10.1017/S0263034617000337 .

Trtica, Milan, Limpouch, Jiri, Gavrilov, Peter T., Hribek, P., Stašić, Jelena, Branković, Goran O., Chen, X., "Surface modification of ASP 30 steel induced by femtosecond laser with 10(14) and 10(13) W/cm(2) intensity in vacuum" in Laser and Particle Beams, 35, no. 3 (2017):534-542,
https://doi.org/10.1017/S0263034617000337 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Limpouch, Jiri
AU  - Gavrilov, Peter T.
AU  - Gemini, L.
AU  - Panjan, Peter
AU  - Stašić, Jelena
AU  - Milovanović, Dubravka S.
AU  - Branković, Goran O.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/715
AB  - A double layer a-CN/TiAlN coating deposited on ASP30 steel substrate was irradiated by femtosecond laser and surface modification effects were observed. Moderate laser intensities used were in the range of 10(14)-10(13) W/cm(2), while the total thickness of double layer coating was 4.8 mu m (a-CN = 0.6 and TiAlN = 4.2 mu m). Laser-induced changes of the surface showed dependence on laser intensity and number of accumulated pulses. Irradiations at the highest intensity resulted in preservation of one or both layers up to 10 pulses, while at lower intensity (10(13) W/cm(2)) a-CN layer is removed after several pulses and TiAlN is preserved up to 50 pulses. Evaluated damage threshold of the target was 0.49 J/cm(2). Lower laser intensity irradiation produced periodic surface structures (LIPSS) over the entire irradiated spot with periodicity of similar to 700 nm, almost in agreement with the laser wavelength used. Irradiations carried out at the highest laser intensity (10(14) W/cm(2)) and laser pulse count of 50 resulted in the creation of crater like damages with depth up to 20 mu m. Craters were conically shaped, implying intensive processes which took place at the surface. Generation of LIPSS as well as craters can be of great interest for contemporary technologies.
T2  - Laser and Particle Beams
T1  - Surface modification of a-CN/TiAlN double layer coating on ASP 30 steel induced by femtosecond laser with 10(13)-10(14) W/cm(2) intensity in vacuum
VL  - 33
IS  - 3
SP  - 551
EP  - 559
DO  - 10.1017/S0263034615000610
ER  - 

@article{
author = "Trtica, Milan and Limpouch, Jiri and Gavrilov, Peter T. and Gemini, L. and Panjan, Peter and Stašić, Jelena and Milovanović, Dubravka S. and Branković, Goran O.",
year = "2015",
abstract = "A double layer a-CN/TiAlN coating deposited on ASP30 steel substrate was irradiated by femtosecond laser and surface modification effects were observed. Moderate laser intensities used were in the range of 10(14)-10(13) W/cm(2), while the total thickness of double layer coating was 4.8 mu m (a-CN = 0.6 and TiAlN = 4.2 mu m). Laser-induced changes of the surface showed dependence on laser intensity and number of accumulated pulses. Irradiations at the highest intensity resulted in preservation of one or both layers up to 10 pulses, while at lower intensity (10(13) W/cm(2)) a-CN layer is removed after several pulses and TiAlN is preserved up to 50 pulses. Evaluated damage threshold of the target was 0.49 J/cm(2). Lower laser intensity irradiation produced periodic surface structures (LIPSS) over the entire irradiated spot with periodicity of similar to 700 nm, almost in agreement with the laser wavelength used. Irradiations carried out at the highest laser intensity (10(14) W/cm(2)) and laser pulse count of 50 resulted in the creation of crater like damages with depth up to 20 mu m. Craters were conically shaped, implying intensive processes which took place at the surface. Generation of LIPSS as well as craters can be of great interest for contemporary technologies.",
journal = "Laser and Particle Beams",
title = "Surface modification of a-CN/TiAlN double layer coating on ASP 30 steel induced by femtosecond laser with 10(13)-10(14) W/cm(2) intensity in vacuum",
volume = "33",
number = "3",
pages = "551-559",
doi = "10.1017/S0263034615000610"
}

Trtica, M., Limpouch, J., Gavrilov, P. T., Gemini, L., Panjan, P., Stašić, J., Milovanović, D. S.,& Branković, G. O.. (2015). Surface modification of a-CN/TiAlN double layer coating on ASP 30 steel induced by femtosecond laser with 10(13)-10(14) W/cm(2) intensity in vacuum. in Laser and Particle Beams, 33(3), 551-559.
https://doi.org/10.1017/S0263034615000610

Trtica M, Limpouch J, Gavrilov PT, Gemini L, Panjan P, Stašić J, Milovanović DS, Branković GO. Surface modification of a-CN/TiAlN double layer coating on ASP 30 steel induced by femtosecond laser with 10(13)-10(14) W/cm(2) intensity in vacuum. in Laser and Particle Beams. 2015;33(3):551-559.
doi:10.1017/S0263034615000610 .

Trtica, Milan, Limpouch, Jiri, Gavrilov, Peter T., Gemini, L., Panjan, Peter, Stašić, Jelena, Milovanović, Dubravka S., Branković, Goran O., "Surface modification of a-CN/TiAlN double layer coating on ASP 30 steel induced by femtosecond laser with 10(13)-10(14) W/cm(2) intensity in vacuum" in Laser and Particle Beams, 33, no. 3 (2015):551-559,
https://doi.org/10.1017/S0263034615000610 . .

TY  - JOUR
AU  - Trtica, Milan
AU  - Batani, Dimitri
AU  - Redaelli, R.
AU  - Limpouch, Jiri
AU  - Kmetik, V.
AU  - Ciganović, Jovan
AU  - Stašić, Jelena
AU  - Gaković, Biljana M.
AU  - Momčilović, Miloš
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5339
AB  - The response of titanium surface irradiated with high intensity (10(13) - 10(15) W/cm(2)) Ti:sapphire laser was studied in vacuum. Most of the reported investigations were conducted with nano- to femtosecond lasers in gas atmospheres while the studies of titanium surface interacting with femtosecond laser in vacuum are scarce. The laser employed in our experiment was operating at 800 nm wavelength and pulse duration of 60 fs in single pulse regime. The observed surface changes and phenomena are (1) creation of craters, (2) formation of periodic surface structures at the reduced intensity, and (3) occurrence of plasma in front the target. Since microstructuring of titanium is very interesting in many areas (industry, medicine), it can be concluded from this study that the reported laser intensities can effectively be applied for micromachining of the titanium surface (increasing the roughness, formation of parallel periodic surface structures etc.).
T2  - Laser and Particle Beams
T1  - Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum
VL  - 31
IS  - 1
SP  - 29
EP  - 36
DO  - 10.1017/S0263034612000924
ER  - 

@article{
author = "Trtica, Milan and Batani, Dimitri and Redaelli, R. and Limpouch, Jiri and Kmetik, V. and Ciganović, Jovan and Stašić, Jelena and Gaković, Biljana M. and Momčilović, Miloš",
year = "2013",
abstract = "The response of titanium surface irradiated with high intensity (10(13) - 10(15) W/cm(2)) Ti:sapphire laser was studied in vacuum. Most of the reported investigations were conducted with nano- to femtosecond lasers in gas atmospheres while the studies of titanium surface interacting with femtosecond laser in vacuum are scarce. The laser employed in our experiment was operating at 800 nm wavelength and pulse duration of 60 fs in single pulse regime. The observed surface changes and phenomena are (1) creation of craters, (2) formation of periodic surface structures at the reduced intensity, and (3) occurrence of plasma in front the target. Since microstructuring of titanium is very interesting in many areas (industry, medicine), it can be concluded from this study that the reported laser intensities can effectively be applied for micromachining of the titanium surface (increasing the roughness, formation of parallel periodic surface structures etc.).",
journal = "Laser and Particle Beams",
title = "Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum",
volume = "31",
number = "1",
pages = "29-36",
doi = "10.1017/S0263034612000924"
}

Trtica, M., Batani, D., Redaelli, R., Limpouch, J., Kmetik, V., Ciganović, J., Stašić, J., Gaković, B. M.,& Momčilović, M.. (2013). Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum. in Laser and Particle Beams, 31(1), 29-36.
https://doi.org/10.1017/S0263034612000924

Trtica M, Batani D, Redaelli R, Limpouch J, Kmetik V, Ciganović J, Stašić J, Gaković BM, Momčilović M. Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum. in Laser and Particle Beams. 2013;31(1):29-36.
doi:10.1017/S0263034612000924 .

Trtica, Milan, Batani, Dimitri, Redaelli, R., Limpouch, Jiri, Kmetik, V., Ciganović, Jovan, Stašić, Jelena, Gaković, Biljana M., Momčilović, Miloš, "Titanium surface modification using femtosecond laser with 10(13)-10(15) W/cm(2) intensity in vacuum" in Laser and Particle Beams, 31, no. 1 (2013):29-36,
https://doi.org/10.1017/S0263034612000924 . .

TY  - JOUR
AU  - Momčilović, Miloš
AU  - Limpouch, Jiri
AU  - Kmetik, V.
AU  - Redaelli, R.
AU  - Savović, Jelena
AU  - Batani, Dimitri
AU  - Stašić, Jelena
AU  - Panjan, Peter
AU  - Trtica, Milan
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4939
AB  - A study of copper target surface modification with high intensity (10(15)W/cm(2), fluence of similar to 300 J/cm(2)) Ti:sapphire laser, operating at 800 nm wavelength and pulse duration of 60 fs is presented. The Cu surface variations were studied in vacuum ambience. The copper target specific surface changes and phenomena observed are: (i) creation of craters (with extra-low diameters); (ii) formation of periodic surface structures especially expressed at the reduced intensity; (iii) presence of the clean surface in the irradiated zone (mainly absence of the oxide(s)), and (iv) occurrence of plasma in front the surface, emitting predominantly X-ray radiation (soft and hard). It can be concluded from this study that the reported laser intensities can effectively be applied for copper surface modification. The appearance of plasma in front of the target, irradiating in the X-ray/UV region, offers additional effect of surface purification facilitating contaminant-free conditions which is highly important for specific applications, e.g. in microelectronics. Generally, femtosecond laser surface modification of copper is non-contact and very rapid compared to traditional modification methods. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Surface modification of copper using high intensity, 10(15)W/cm(2), femtosecond laser in vacuum
VL  - 258
IS  - 22
SP  - 8908
EP  - 8914
DO  - 10.1016/j.apsusc.2012.05.113
ER  - 

@article{
author = "Momčilović, Miloš and Limpouch, Jiri and Kmetik, V. and Redaelli, R. and Savović, Jelena and Batani, Dimitri and Stašić, Jelena and Panjan, Peter and Trtica, Milan",
year = "2012",
abstract = "A study of copper target surface modification with high intensity (10(15)W/cm(2), fluence of similar to 300 J/cm(2)) Ti:sapphire laser, operating at 800 nm wavelength and pulse duration of 60 fs is presented. The Cu surface variations were studied in vacuum ambience. The copper target specific surface changes and phenomena observed are: (i) creation of craters (with extra-low diameters); (ii) formation of periodic surface structures especially expressed at the reduced intensity; (iii) presence of the clean surface in the irradiated zone (mainly absence of the oxide(s)), and (iv) occurrence of plasma in front the surface, emitting predominantly X-ray radiation (soft and hard). It can be concluded from this study that the reported laser intensities can effectively be applied for copper surface modification. The appearance of plasma in front of the target, irradiating in the X-ray/UV region, offers additional effect of surface purification facilitating contaminant-free conditions which is highly important for specific applications, e.g. in microelectronics. Generally, femtosecond laser surface modification of copper is non-contact and very rapid compared to traditional modification methods. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Surface modification of copper using high intensity, 10(15)W/cm(2), femtosecond laser in vacuum",
volume = "258",
number = "22",
pages = "8908-8914",
doi = "10.1016/j.apsusc.2012.05.113"
}

Momčilović, M., Limpouch, J., Kmetik, V., Redaelli, R., Savović, J., Batani, D., Stašić, J., Panjan, P.,& Trtica, M.. (2012). Surface modification of copper using high intensity, 10(15)W/cm(2), femtosecond laser in vacuum. in Applied Surface Science, 258(22), 8908-8914.
https://doi.org/10.1016/j.apsusc.2012.05.113

Momčilović M, Limpouch J, Kmetik V, Redaelli R, Savović J, Batani D, Stašić J, Panjan P, Trtica M. Surface modification of copper using high intensity, 10(15)W/cm(2), femtosecond laser in vacuum. in Applied Surface Science. 2012;258(22):8908-8914.
doi:10.1016/j.apsusc.2012.05.113 .

Momčilović, Miloš, Limpouch, Jiri, Kmetik, V., Redaelli, R., Savović, Jelena, Batani, Dimitri, Stašić, Jelena, Panjan, Peter, Trtica, Milan, "Surface modification of copper using high intensity, 10(15)W/cm(2), femtosecond laser in vacuum" in Applied Surface Science, 258, no. 22 (2012):8908-8914,
https://doi.org/10.1016/j.apsusc.2012.05.113 . .