SAPYTSKA, I. Restructuring of coal mines: theory and practice. Skhid, [S. l.], n. 4(124), p. 71–75, 2013. DOI: 10.21847/1728-9343.2013.4(124).16942. Disponível em: http://skhid.kubg.edu.ua/article/view/16942. Acesso em: 9 dec. 2021.