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Journal of the Knowledge Economy > 2018 > 9 > 3 > 896-907
Acta Scientifica Academiae Ostroviensis. Sectio A, Nauki Humanistyczne,... > 2016 > 7(1)/2016 > 50-59
Journal of the Knowledge Economy > 2014 > 5 > 2 > 294-304
Gospodarka Narodowa. The Polish Journal of Economics > 2007 > 214 > 3 > 7-23