1. Oscillations of first order neutral delay differential equations;Grammatikopoulos;J. Math. Anal. Appl.,1986
2. On the oscillatory and monotone solutions of the first order differential equations with deviating arguments;Koplatadze;Differentsial'nye Uravneniya,1982
3. On the oscillatory and monotone solutions of the first order differential equations with deviating arguments;Koplatadze;Differentsial'nye Uravneniya,1982
4. Necessary and sufficient condition for oscillations of neutral differential equations;Kulenovic;J. Austral. Math. Soc. Ser. B,1987
5. Oscillations of neutral delay differential equations;Ladas;Canad. Math. Bull. T. 29 F.4,1986