1. M. K. Grammatikopoulos,On the oscillation of bounded solutions of differential equations with deviating arguments, Czechoslovak Math. J.,2 (102) (1977), pp. 186–200 (Russian).
2. M. K. Grammatikopoulos - Y. G. Sficas - V. A. Staikos,Oscillatory properties of strongly superlinear differential equations with deviating arguments, J. Math. Anal. Appl. (to appear).
3. I. T. Kiguradze,On the oscillation of solutions of the equation d m u/dt m +a(t)|u| n sgnu=0, Mat. Sb.,65 (1964), pp. 172–187 (Russian).
4. I. T. Kiguradze,The problem of oscillations of solutions of nonlinear differential equations, Differencial'nye Uravenija,1 (1965), pp. 995–1006 (Russian).
5. T. Kusano -M. Naito,Nonlinear oscillation of second order differential equations with retarded arguments, Ann. Mat. Pura Appl.,106 (1975), pp. 171–185.