中国科学院数学与系统科学研究院期刊网
The Existence and Nonexistence of Positive Solutions for Second-Order Sturm-Liouville Eigenvalue Problems
Hua SU, Li Shan LIU
Acta Mathematica Sinica, Chinese Series . 2014, (6): 1241 -1248 .  DOI: 10.12386/A2014sxxb0115