KIM, Sung Soo; PLEWIK, Szymon. Discontinuity and involutions on countable sets. Annales Mathematicae Silesianae, [S. l.], v. 17, p. 7–8, 2003. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14096. Acesso em: 7 may. 2025.