H. YOUSEF, A.; A. JASEM, I. Solution conditions for confusing boundary values. Journal of Education and Science (JES), [S. l.], v. 18, n. 2, p. 90–103, 2006. DOI: 10.33899/edusj.2006.79277. Disponível em: https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23582. Acesso em: 5 aug. 2025.