Multiple positive solutions of singular p -Laplacian problems by variational methods. Perera, Kanishka; Zhang, Zhitao — 2005 Boundary Value Problems [electronic only]
Multiple nodal solutions for some fourth-order boundary value problems via admissible invariant sets. Yang, Yang; Zhang, Jihui; Zhang, Zhitao — 2008 Boundary Value Problems [electronic only]
On an asymptotically linear elliptic Dirichlet problem. Zhang, Zhitao; Li, Shujie; Liu, Shibo; Feng, Weijie — 2002 Abstract and Applied Analysis