中国科学院数学与系统科学研究院期刊网
AMS
Existence of Positive Solutions to Fourth Order Quasilinear Boundary Value Problems
Zhan Bing BAI, Wei Gao GE
Acta Mathematica Sinica . 2006, (6): 1825 -1830 .  DOI: 10.1007/s10114-005-0806-z