M. LELLIS THIVAGAR; M. ANBUCHELVI. A new classes of open mappings. Malaya Journal of Matematik, India, v. 1, n. 02, p. 18–28, 2013. DOI: 10.26637/mjm102/003. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/346. Acesso em: 16 jul. 2024.