1. Theory of Functional Differential Equations;Hale,1977
2. Oscillation Theory for Neutral Differential Equations with Delay;Bainov,1992
3. Oscillation Theory of Differential Equations with Deviating Arguments;Ladde,1987
4. Nonlinear oscillation of a sublinear delay equation of arbitrary order;Kusano;Pro. Amer. Math. Soc.,1973
5. Asymptotic behavior and oscillation in higher order differential equations with retarded arguments;Dahiya;Acta Math. Hungar.,1997