1. Deterministic mathematical models in population ecology;Freedman,1980
2. Stability and oscillations in delay differential equations of population dynamics;Gopalsamy,1992
3. Stability and complexity in model ecosystems;May,1973
4. Delay differential equations with applications in population dynamics;Kuang,1993
5. Global analysis in some delayed ratio-dependent predator–prey systems;Beretta;Nonlinear Anal TMA,1998