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ECONTECHMOD : An International Quarterly Journal on Economics of Technology... > 2017 > Vol. 6, No 1 > 71--80
Acta Innovations > 2016 > no. 21 > 13--25
Polish Journal of Management Studies > 2013 > Vol. 7 > 212--220
Acta Innovations > 2013 > no. 7 > 27--32