Positive solutions of boundary value problems for systems of second-order differential equations with integral boundary condition on the half-line. Xi, Shouliang; Jia, Mei; Ji, Huipeng — 2009 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Multiple positive solutions for boundary value problems of second-order differential equations system on the half-line. Xi, Shouliang; Jia, Mei; Ji, Huipeng — 2010 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Multiple nonnegative solutions for second-order boundary-value problems with sign-changing nonlinearities. Xi, Shouliang; Jia, Mei; Ji, Huipeng — 2009 Electronic Journal of Differential Equations (EJDE) [electronic only]