Błażejowska, M. and Gostomczyk, W. 2018. Conditions for the Creation and State of Development of Cooperatives and Energy Clusters in Poland Compared with Germany. Scientific Journal of Warsaw University of Life Sciences – SGGW Problems of World Agriculture . 18, 2 (Jun. 2018), 20–32. DOI:https://doi.org/10.22630/PRS.2018.18.2.31.