Kulpa, Władysław, and Andrzej Szymański. “Applications of Automatic Quasi-Continuity”. Annales Mathematicae Silesianae 19 (September 30, 2005): 31–40. Accessed July 2, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14082.