Positive solutions to nonlinear second-order three-point boundary-value problems for difference equation with change of sign. Wang, Chunli; Han, Xiaoshuang; Li, Xiaoshuang — 2008 Electronic Journal of Differential Equations (EJDE) [electronic only]
Positive solutions for nonlinear semipositone n th-order boundary value problems. Xie, Dapeng; Bai, Chuanzhi; Liu, Yang; Wang, Chunli — 2008 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Existence of positive solutions for nth-order boundary value problem with sign changing nonlinearity. Xie, Dapeng; Bai, Chuanzhi; Liu, Yang; Wang, Chunli — 2008 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]