Dhanya, Rajendran, Ratnasingham Shivaji, and Byungjae Son. “A Three Solution Theorem for a Singular Differential Equation With Nonlinear Boundary Conditions”. Topological Methods in Nonlinear Analysis 54, no. 2 (July 27, 2019): 445–457. Accessed January 1, 2026. https://apcz.umk.pl/TMNA/article/view/TMNA.2019.044.