The Problem of the Optimal Control with a Lower Coefficient for Weakly Nonlinear Wave Equation in the Mixed Problem. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 13, n. 2, p. 314–322, 2020. DOI: 10.29020/nybg.ejpam.v13i2.3650. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3650. Acesso em: 22 dec. 2024.