1. A non-linear difference-differential equation;Wright;J. reine angew. Math.,1955
2. A non-linear differential-difference equation of growth;Cunningham,1954
3. On the non-linear difference-differential equation y′(t) = [A − By(t − τ)] y(t);Kakutani,1958
4. On a generalization of the Schauder fixed point theorem;Browder;Duke Math. J.,1959
5. Asymptotic behavior and periodic solutions of a nonlinear differential-difference equation;Jones,1961