1. Mathematical Bioeconomics;Clark,1976
2. Model stability and maturation periods in age structured populations;Cushing;J. Theo. Biol.,1980
3. Volterra Integrodifferential Equations in Population Dynamics;Cushing,1981
4. Periodic Kolmogorov systems;Cushing;SIAM J. Math. Anal.,1982
5. Bifurcation of time periodic solutions of the McKendrick equations with applications to population dynamics;Cushing;Comp. & Math. Appl. No. 3,1983