Spanish Ministerio de Education y Ciencia [MAT2013-47395-C4-1-R, MAT2016-75362-C3-1-R]
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http://vinar.vin.bg.ac.rs/APP/faces/project.xhtml?project_id=Spanish+Ministerio+de+Education+y+Ciencia+%5BMAT2013-47395-C4-1-R%2C+MAT2016-75362-C3-1-R%5D&item_offset=0&author_offset=0&sort_by=dc.date.issued