M. AHMED, A.; Z . SULYMAN, E. Improving Mechanical and Thermal Properties for Unsaturated Polyester Resin by Adding Sisal Fibers. College of Basic Education Research Journal, [S. l.], v. 19, n. 1, p. 781–804, 2023. DOI: 10.33899/berj.2023.178138. Disponível em: https://edusj.uomosul.edu.iq/index.php/berj/article/view/39652. Acesso em: 26 oct. 2025.