Kulpa, W., Plewik, S. and Turzański, M. (2003) “Bolzano-Weierstrass principle of choice extended towards ordinals”, Annales Mathematicae Silesianae, 17, pp. 9–16. Available at: https://journals.us.edu.pl/index.php/AMSIL/article/view/14097 (Accessed: 5 December 2025).