1. Numerical Methods for Delay Differential Equations;Bellen,2003
2. Differential-Difference Equations;Bellman,1963
3. A converse lyapunov theorem for a class of dynamical systems which undergo switching;Dayawansa;IEEE Trans. Automat. Control,1999
4. Ordinary and Delay Differential Equations;Driver,1977
5. Introduction to the Theory and Application of Differential Equations with Deviating Arguments;El’sgol’ts,1973