Djibaoui, Meriem, and Toufik Moussaoui. “Variational Methods to Second-Order Dirichlet Boundary Value Problems With Impulses on the Half-Line”. CUBO, A Mathematical Journal 24, no. 2 (August 22, 2022): 227–237. Accessed March 29, 2024. https://cubo.ufro.cl/ojs/index.php/cubo/article/view/3096.