中国科学院数学与系统科学研究院期刊网
AMS
Oscillation Theorems for Quasilinear Elliptic Differential Equations
Zhi Ting XU
Acta Mathematica Sinica . 2007, (7): 1189 -1198 .  DOI: 10.1007/s10114-005-0853-5