KULPA, Władysław; PLEWIK, Szymon; TURZAŃSKI, Marian. Bolzano-Weierstrass principle of choice extended towards ordinals. Annales Mathematicae Silesianae, [S. l.], v. 17, p. 9–16, 2003. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14097. Acesso em: 16 dec. 2025.