M. ALI, A. Wiener Polynomials for Multi-Rings Paraffin Structures. AL-Rafidain Journal of Computer Sciences and Mathematics, [S. l.], v. 4, n. 2, p. 31–40, 2007. DOI: 10.33899/csmj.2007.164025 . Disponível em: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36680. Acesso em: 17 dec. 2025.