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Management > 2016 > 20 > 1 > 368-381
Gospodarka Narodowa. The Polish Journal of Economics > 2012 > 255 > 4 > 31-60
Gospodarka Narodowa > 2012 > 4 > 31-60
Olsztyn Economic Journal > 2007 > 2 > 1 > 101-113
Olsztyn Economic Journal > 2007 > 2 > 1 > 101-113