Positive solutions of singular fourth-order boundary-value problems. Cui, Yujun; Zou, Yumei — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]
Existence and uniqueness of solutions for fourth-order boundary-value problems in Banach spaces. Cui, Yujun; Zou, Yumei — 2009 Electronic Journal of Differential Equations (EJDE) [electronic only]