Nomirovs’kiiD. A. “Convergence of the Galerkin Method for a Wave Equation With Singular Right-Hand Side”. Ukrains’kyi Matematychnyi Zhurnal 58, no. 6 (June 25, 2006): 778–786. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3495.