MALEC, Edward. Black holes: do they exist?. Philosophical Problems in Science (Zagadnienia Filozoficzne w Nauce), [S. l.], n. 65, p. 47–59, 2018. DOI: 10.59203/zfn.65.438. Disponível em: https://www.zfn.edu.pl/index.php/zfn/article/view/438. Acesso em: 26 nov. 2025.