Kolosok, V., Vereskun, M., Drobotina, K. and Uhrovata, Y. 2013. Comparison of enterprise efficiency of mining-metallurgical corporate structures Ukraine. Skhid. 1(115) (Aug. 2013), 43–49. DOI:https://doi.org/10.21847/1728-9343.2012.1(115).16326.