The Necessary Condition for Optimal Boundary Control Problems for Triple Elliptic Partial Differential Equations. Ibn AL-Haitham Journal For Pure and Applied Sciences, [S. l.], v. 34, n. 1, 2021. DOI: 10.30526/34.1.2557. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/2557.. Acesso em: 3 may. 2024.