中国科学院数学与系统科学研究院期刊网
Necessary and Sufficient Condition for the Existence of Positive Solution to a Class of Singular Second-order Boundary Value Problems
Shi Xia LUAN, Yan Ling ZHAO
Acta Mathematica Sinica, Chinese Series . 2010, (6): 1163 -1170 .  DOI: 10.12386/A2010sxxb0129