1. The Existence of periodic solutions of ƒ′(x) = −αƒ(x − 1){1 + ƒ(x)};Jones;J. Math. Anal. Appl.,1962
2. Periodic Functions Generated As Solutions of Nonlinear Differential-Difference Equations;Jones,1962
3. Periodic motions in Banach space and applications to functional differential equations;Jones;Contrs. Diff. Eqs.,1964
4. A nonlinear difference-differential equation;Wright;J. Reihe Ang. Math.,1955
5. Linear Functional-Differential Equations With Constant Coefficients;Hale;Contrs. Diff. Eqs.,1963