中国科学院数学与系统科学研究院期刊网
Multiple Solutions for Superlinear Operator Equations in Banach Spaces and Applications
Ke Mei ZHANG(1), Jing Xian SUN
Acta Mathematica Sinica, Chinese Series . 2005, (1): 99 -108 .  DOI: 10.12386/A2005sxxb0011