Santiago Ayala, Yolanda, and Santiago Rojas Romero. “Existence and Continuous Dependence of the Solution of Non Homogeneous Wave Equation in Periodic Sobolev Spaces”. Selecciones Matemáticas 7, no. 01 (July 25, 2020): 52-73. Accessed March 28, 2024. https://revistas.unitru.edu.pe/index.php/SSMM/article/view/2957.