1. A note on “The discrete Lyapunov function…”;Arino;J. Differential Equations,1993
2. The discrete Lyapunov function for scalar delay differential equations;Cao;J. Differential Equations,1990
3. Theory of Ordinary Differential Equations;Coddington,1955
4. Distributional and small solutions for linear time-dependent delay equations;Cooke;Differential Integral Equations,1993
5. Stability and Asymptotic Behavior of Differential Equations;Coppel,1965