H. ISMAIL, T.; طاهر; O. HAMAD, I.; إبراهیم. A Nonstandard Generalization of Envelopes. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 5, n. 2, p. 73–83, 2025. Disponível em: https://edusj.uomosul.edu.iq/index.php/csmj/article/view/36973. Acesso em: 10 sep. 2025.