1. The Hopf bifurcation theorem in infinite dimensions;Crandall;Arch. Rational Mech. Anal.,1972
2. An operator equation and bounded solutions of integrodifferential systems;Cushing;SIAM J. Appl. Math.,1975
3. Forced asymptotically periodic solutions of predator-prey systems with or without hereditary effects;Cushing;SIAM J. Appl. Math.,1976
4. Periodic solutions of Volterra's population equation with hereditary effects;Cushing;SIAM J. Appl. Math.,1976