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Studia Ekonomiczne > 2017 > 311 > 156-166
Regulation & Governance > 6 > 4 > 524 - 544
Czech Journal of Social Sciences, Business and Economics > 2012 > 1 > 1 > 46-54
Optimum. Studia Ekonomiczne > 2011 > 4(52) > 79-94
Sustainable Development > 18 > 1 > 12 - 19
Frontiers of Education in China > 2008 > 3 > 1 > 45-63