1. A non-linear difference-differential equation;Wright;J. Reine Angew. Math.,1955
2. On the non-linear difference-differential equation y'(t) = [a − by(t − τ)]y(t),;Kakutani,1958
3. Delay Equations;Diekmann,1995
4. Mathematica;Wolfram,1991
5. Step by step Tau method-Part I;Ortiz;Computers Math. Applic.,1975