1. Functional differential equations and Jensen's inequality;Becker;J. Math. Anal. Appl.,1989
2. Uniform asymptotic stability in functional differential equations;Burton,1978
3. Stability and Periodic Solutions of Ordinary and Functional Differential Equations;Burton,1985
4. The nonlinear wave equation as a Liénard equation;Burton;Funkcial. Ekvac.,1991
5. Upper and lower bounds for Liapunov functionals;Burton;Funkcial. Ekvac.,1989