1. On the oscillation of solutions of the equation dnu/dtn + a(t)|u|n sign u = 0;Kiguradze;Math. Sb.,1964
2. The problem of oscillation of solutions of nonlinear differential equations;Kiguradze;Differentsial'nye Uravneniya,1965
3. Positive solutions of a class of nonlinear ordinary differential equations;Kusano;Nonlinear Anal. TMA,1988
4. Positive solutions of functional differential equations with singular nonlinear term;Kusano;Nonlinear Anal. TMA,1984
5. Nonoscillation theorems for differential equations with general deviating arguments;Fink,1993