1. System with impulsive effect: stability, theory and applications;Bainov,1989
2. Age-dependent predation is not a simple process. I. Continuous time models;Hastings;Theor Popul Biol,1983
3. Delay in recruitment at different trophic levels, effects on stability;Hastings;J Math Biol,1984
4. Theory of impulsive differential equations;Laksmikantham,1989
5. Variazione e fluttuazini del numerod’individui in specie animali convienti;Volterra;Mem Acad Nazionale Lincei (Ser. 6),1926