On Some α-Proper Mapping Types. Journal of the College of Basic Education, [S. l.], v. 18, n. 74, p. 29–44, 2023. DOI: 10.35950/cbej.v18i74.8650. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/8650.. Acesso em: 19 jul. 2024.