Averaging techniques and oscillation of quasilinear elliptic equations
Zhi-Ting Xu, Bao-Guo Jia, Shao-Yuan Xu (2004)
Annales Polonici Mathematici
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By using averaging techniques, some oscillation criteria for quasilinear elliptic differential equations of second order are obtained. These results extend and generalize the criteria for linear differential equations due to Kamenev, Philos and Wong.