中国科学院数学与系统科学研究院期刊网
Positive Solutions of Boundary Value Problems for Nonlinear Singular Differential Equations in Banach Space
Yan Sheng LIU
Acta Mathematica Sinica, Chinese Series . 2004, (1): 131 -140 .  DOI: 10.12386/A2004sxxb0019