We establish oscillation criteria for solutions of quasilinear second order elliptic equations. We do not impose any additional conditions on the nonlinear terms except for the continuity. In particular, we can characterize the oscillation property of every solution for autonomous equations.
Tomomitsu Teramoto. Hiroyuki Usami. "Oscillation theorems of quasilinear elliptic equations with arbitrary nonlinearities." Differential Integral Equations 20 (5) 577 - 600, 2007. https://doi.org/10.57262/die/1356039444