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Edukacja-Technika-Informatyka > 2013 > 4 > 2 > 67-72
Journal of Evolutionary Economics > 2018 > 28 > 2 > 225-243
IT Professional > 2012 > 14 > 4 > 56 - 58
IT Professional > 2012 > 14 > 4 > 14 - 17
Procedia Economics and Finance > 2012 > 1 > Complete > 239-248