On the oscillation of second order quasilinear elliptic equations

By using the Riccati technique, some oscillation criteria for the second order quasilinear elliptic equation $\sum _{i,j=1}^N{D}_i\left[\Phi \left(y\right)A_{ij}\left(x\right){\left|Dy\right|}^{p-2}{D}_{j}y\right]+p\left(x\right)f\left(y\right)=0$ are established. These results contain the known oscillation theorems from the literature as special cases.