Oscillation of solutions of second-order neutral delay differential equations with integrable coefficients

Some necessary conditions are established for the nonoscillation of solutions of the second-order neutral delay differential equation [a(t)(x (t) + p(t)x(t − τ)′]′ + q(t)f(x(t − σ)) = 0. Using these results, we obtain some oscillation criteria for the above equation.