中国科学院数学与系统科学研究院期刊网
Existence of Positive Solutions of Nonlinear Neumann Problems
Ru Yun MA, Rui Peng CHEN, Jie Mei LI
Acta Mathematica Sinica, Chinese Series . 2013, (3): 289 -300 .  DOI: 10.12386/A2013sxxb0030