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ECONTECHMOD : An International Quarterly Journal on Economics of Technology... > 2016 > Vol. 5, No 2 > 17--26
Problemy Ekorozwoju > 2014 > Vol. 9, nr 2 > 65--72
ECONTECHMOD : An International Quarterly Journal on Economics of Technology... > 2016 > Vol. 5, No 2 > 17--26
Problemy Ekorozwoju > 2014 > Vol. 9, nr 2 > 65--72