CHAUDHURI, A. K.; TARAFDAR, E. On Certain Properties of Mappings. The Journal of the Indian Mathematical Society, [S. l.], v. 29, n. 1-2, p. 101–107, 1965. DOI: 10.18311/jims/1965/16829. Disponível em: http://www.informaticsjournals.com/index.php/jims/article/view/16829. Acesso em: 20 may. 2024.