中国科学院数学与系统科学研究院期刊网
The Existence of Two Positive Solutions of Singular Boundary Value Problem of Fourth Order Differential Equations
Chang Ci PANG,Zhong Li WEI
Acta Mathematica Sinica, Chinese Series . 2003, (2): 403 -410 .  DOI: 10.12386/A2003sxxb0056