KefiK. “Multiple Solutions for a $p(x)$-Laplacian-Like Problem under Neumann Boundary Condition”. Ukrains’kyi Matematychnyi Zhurnal 76, no. 8 (September 4, 2024): 1158 - 1167. Accessed October 11, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7575.