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Research in Logistics & Production > 2017 > Vol. 7, No. 2 > 103--112
Ekonomia XXI Wieku > 2015 > 4 (8) > 9-19
Comparative Economic Research > 2014 > 17 > 3 > 101-122
Comparative Economic Research. Central and Eastern Europe > 2014 > 17 > 3 > 101-122