HEDER, A.; TKOCZ, M. The Functioning of Coal Mining in a Knowledge-Based Economy. Studies of the Industrial Geography Commission of the Polish Geographical Society, [S. l.], v. 21, p. 78–93, 2013. DOI: 10.24917/20801653.21.5. Disponível em: https://prace-kgp.uken.krakow.pl/article/view/1196. Acesso em: 12 jun. 2024.