HAMEED HAMZ, Sattar; MIZHEIR MAJHOOL, Fatima. Strongly N-proper Functions. Journal of Al-Qadisiyah for Computer Science and Mathematics, [S. l.], v. 3, n. 2, p. 183–199, 2017. Disponível em: https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/288. Acesso em: 19 sep. 2024.