Santiago Ayala, Yolanda, and Santiago Rojas Romero. “Existence and Regularity of the Solution of Non Homogeneous Schrödinger Equation in Periodic Sobolev Spaces”. Selecciones Matemáticas 8, no. 01 (July 29, 2021): 37 - 51. Accessed April 26, 2024. https://revistas.unitru.edu.pe/index.php/SSMM/article/view/3700.