Multiplicity theorems for semipositone p -Laplacian problems. Shang, Xudong — 2011 Electronic Journal of Differential Equations (EJDE) [electronic only]
Existence of positive solutions for quasilinear elliptic systems involving the p -Laplacian. Shang, Xudong; Zhang, Jihui — 2009 Electronic Journal of Differential Equations (EJDE) [electronic only]