KHNEAB , Alaa S.; AL-HAWASY, Jamil Amir; CHRYSSOVERGHI , Ion. Quaternary Boundary Optimal Control Problem for Quaternary Nonlinear Elliptic System with Constraints. Al-Mustansiriyah Journal of Science, Baghdad, Iraq, v. 35, n. 4, p. 31–41, 2024. DOI: 10.23851/mjs.v35i4.1546. Disponível em: https://mjs.uomustansiriyah.edu.iq/index.php/MJS/article/view/1546.. Acesso em: 5 jul. 2025.