HASSAN, I. M. .; ALHSWEM, S. A. . On the System of Nonlinear Elliptic Equations with Nonlocal Boundary Conditions of Neumnna Type. The Libyan Journal of Science, [S. l.], v. 23, n. 1, p. 31–39, 2022. DOI: 10.55276/ljs.v23i1.119. Disponível em: https://journals.uot.edu.ly/index.php/ljs/article/view/119. Acesso em: 19 apr. 2026.