Lee, Yong-Hoon, and Inbo Sim. “Existence of Sign-Changing Solutions for One-Dimensional $p$-Laplacian Problems With a Singular Indefinite Weight”. Topological Methods in Nonlinear Analysis 36, no. 1 (April 23, 2010): 61–90. Accessed July 3, 2025. https://apcz.umk.pl/TMNA/article/view/TMNA.2010.028.