Oscillation of second order semilinear elliptic equations with damping

We obtain some new Kamenev-type oscillation theorems for the second order semilinear elliptic differential equation with damping

$ \sum\limits_{i,j = 1}^N {D\left {a_{ij} \left( x \right)D_j y} \right] + } \sum\limits_{i = 1}^N {b_i \left( x \right)D_i y + c\left( x \right)f\left( y \right) = 0} $ \sum\limits_{i,j = 1}^N {D\left {a_{ij} \left( x \right)D_j y} \right] + } \sum\limits_{i = 1}^N {b_i \left( x \right)D_i y + c\left( x \right)f\left( y \right) = 0}
Keywords:	Oscillation  damped  semilinear  elliptic differential equations  second order
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