1. Stability and Oscillation in Delay Differential Equations of Population Dynamics;Gopalsamy,1992
2. Nicholson’s blowflies revisited;Gurney;Nature,1980
3. Existence and stability of periodic solutions of semilinear neutral type systems;Gil;Dyn. Discrete Contin. Syst.,2001
4. Global attractivity and uniform persistence in Nicholson’s blowflies;Joseph;Differential Equations Dynam. Systems,1994
5. Existence of positive periodic solutions for Volterra integro-differential equations;Jiang;Acta Math. Sci.,2002