References
- Aftabizadeh , A. R. , Wiener , J. and Xu , J.M. 1987 . Oscillatory and periodic solutions of delay differential equations with piecewise constant argument . Proc. Amer. Math. Soc , 99 : 673 – 679 .
- Cooke , K. L. and Wiener , J. 1984 . Retarded differential equations with piecewise constant delays . J. Math. Anal. Appl , 99 : 265 – 297 .
- Cooke , K.L. and Wiener , J. 1987 . An equation alternately of retarded and advanced type . Proc. Amer. Math. Soc , 99 : 726 – 732 .
- Huang , Y. K. 1990 . Oscillations and asymptotic stability of solutions of first order neutral differential equations with piecewise constant argument . J. Math. Anal. Appl , 149 : 70 – 85 .
- Ladas , G. , Partheniadis , E.C. and Schinas , J. 1989 . “ Existence theorems for second order differential equations with piecewise constant argument ” . In Differential Equations,Lecture Notes in Pure and Appl. Math. , Vol. 118 , 389 – 395 . New York : Dekker . Xanthi, 1987
- Partheniadis , E.C. 1988 . “ Oscillations and asymptotic behavior of solutions of delay and neutral delay differential equations ” . In Ph.D. Thesis , University of Rhode Island : Zurich Universitat .