Oscillation criteria for a class of second-order nonlinear differential equations with damping term. Ouyang, Zigen; Zhong, Jichao; Zou, Shuliang — 2009 Abstract and Applied Analysis
Existence of positive solutions to a boundary value problem for a delayed nonlinear fractional differential system. Ouyang, Zigen; Chen, Yuming; Zou, Shuliang — 2011 Boundary Value Problems [electronic only]