MALEC, Edward. Black holes: do they exist?. Philosophical Problems in Science, [S. l.], n. 65, p. 47–59, 2018. DOI: 10.59203/zfn.65.438. Disponível em: https://zfn.edu.pl/index.php/zfn/article/view/438. Acesso em: 8 dec. 2025.