BROŻEK, B.; OLSZEWSKI, A. Hilbert’s mathematical subject. Philosophical Problems in Science (Zagadnienia Filozoficzne w Nauce), [S. l.], n. 53, p. 93–132, 2013. Disponível em: https://zfn.edu.pl/index.php/zfn/article/view/59. Acesso em: 25 sep. 2022.