SINGH, D. Almost perfectly continuous functions. Quaestiones Mathematicae, [S. l.], v. 33, n. 2, 2010. DOI: 10.2989/16073606.2010.491187. Disponível em: https://www.ajol.info/index.php/qm/article/view/55737. Acesso em: 7 nov. 2026.