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Studia Iuridica Lublinensia > 2019 > 28 > 1
Perspectives of Innovations, Economics and Business > 2015 > 15 > 1 > 57-66
Academicus. International Scientific Journal > 2013 > 7 > 62-71
Wiadomości Statystyczne. The Polish Statistician > 2006 > nr 1 > 44-54