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Acta Innovations > 2019 > no. 33 > 100--110
Polish Journal of Management Studies > 2019 > Vol. 19, No. 1 > 204--214
AGH Journal of Mining and Geoengineering > 2012 > Vol. 36, no. 3 > 243-252
Acta Innovations > 2019 > no. 33 > 100--110
Polish Journal of Management Studies > 2019 > Vol. 19, No. 1 > 204--214
AGH Journal of Mining and Geoengineering > 2012 > Vol. 36, no. 3 > 243-252