1. Stability and Periodic Solutions of Ordinary and Functional Differential Equations;Burton,1985
2. Stability by fixed point theory or Liapunov's theory: a comparison;Burton;Fixed Point Theory,2003
3. T.A. Burton, Stability and fixed points: addition of terms, Dynamic Systems Appl. 13 (2004) 459–478.
4. On the delay differential equations x′+a(t)f(x(t-r(t))=0 and x′′(t)+af(x(t-r(t))=0;Burton;J. Math. Anal. Appl.,1976
5. Asymptotic behavior of solutions of differential equations with variable delays;Graef;Proc. London Math. Soc.,2000