MAHMOOD, S. I. . On A Bitopological (1,2)*- Proper Functions. Ibn AL-Haitham Journal For Pure and Applied Sciences, [S. l.], v. 26, n. 2, p. 358–373, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/483. Acesso em: 27 jun. 2022.