KALIŃSKI, Janusz. Lignite Basins in Poland after 1945. Kwartalnik Kolegium Ekonomiczno-Społecznego. Studia i Prace, [S. l.], n. 2, p. 107–130, 2017. DOI: 10.33119/KKESSiP.2017.2.6. Disponível em: https://econjournals.sgh.waw.pl/kwes/article/view/24. Acesso em: 11 maj. 2024.