The following publications are possibly variants of this publication:
- A necessary and sufficient condition for the existence of positive solutions of singular boundary value problemsYumei Xu, Lishan Li, Lokenath Debnath. appml, 18(8):881-889, 2005. [doi]
- Existence of positive solutions of singular elliptic boundary value problems in a ballYingye Xu, Luanying Lian, Lokenath Debnath. cma, 61(5):1335-1341, 2011. [doi]
- Existence and multiplicity of positive solutions for singular fractional boundary value problemsZhanbing Bai, Weichen Sun. cma, 63(9):1369-1381, 2012. [doi]