中国科学院数学与系统科学研究院期刊网
Existence of Sign-Changing Solutions for Nonlinear Operator Equations and Its Applications
Ke Mei ZHANG(1),Jing Xian SUN(
Acta Mathematica Sinica, Chinese Series . 2003, (4): 815 -822 .  DOI: 10.12386/A2003sxxb0109