Existence of infinitely many nodal solutions for a superlinear Neumann boundary value problem. Qian, Aixia — 2005 Boundary Value Problems [electronic only]
On the existence of nontrivial solutions for a fourth-order semilinear elliptic problem. Qian, Aixia; Li, Shujie — 2005 Abstract and Applied Analysis
Infinitely many solutions for a Robin boundary value problem. Qian, Aixia; Li, Chong — 2010 International Journal of Differential Equations