中国科学院数学与系统科学研究院期刊网
Existence and Multiplicity of Solutions for Four-Point Boundary Value Problems at Resonance
Hui Hui PANG Wei Gao GE
Acta Mathematica Sinica, Chinese Series . 2007, (3): 557 -566 .  DOI: 10.12386/A2007sxxb0066