References
- Carvalho , L.A.V. and Cooke , K.L . 1988 . A nonlinear equation with piecewise continuous argument . Diff. Integral Eq , 1 : 359 – 367 .
- Devaney , R.L. 1986 . An Introduction to Chaotic Dynamical System , Menlo Park : The Ben¬jamin/Cummings Publishing Co .
- Huang , R.Y.K. 1988 . Functional Differential Equations with Piecewise Constant Arguments , Ohio Univ .