Three positive solutions for a system of singular generalized Lidstone problems. Xu, Jiafa; Yang, Zhilin — 2009 Electronic Journal of Differential Equations (EJDE) [electronic only]
Positive solutions for singular Sturm-Liouville boundary value problems on the half line. Xu, Jiafa; Yang, Zhilin — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]
Multiple positive solutions of a singular fractional boundary value problem. Xu, Jiafa; Yang, Zhilin — 2010 Applied Mathematics E-Notes [electronic only]