KALIŃSKI, J. Węgiel w polsko-radzieckich stosunkach gospodarczych. UR Journal of Humanities and Social Sciences, [S. l.], v. 20, n. 3, p. 93–112, 2021. DOI: 10.15584/johass.2021.3.6. Disponível em: https://journals.ur.edu.pl/jhss/article/view/7724. Acesso em: 21 lis. 2024.