1. Caughley, G.: Analysis of Vertebrate Populations. Wiley, New York (1977)
2. Chatterjee, S., Isaia, M., Venturino, E.: Effects of spiders predational delays in intensive. Nonlinear Anal. 10, 3045–3058 (2009)
3. Hui, J., Chen, L.S.: Dynamic complexities in ratio-dependent predator-prey ecosystem models with birth pulse and pesticide pulse. Int. J. Bifurc. Chaos 14(8), 2893–2903 (2004)
4. Jiao J.J., Cai S.H., Chen L.S.: Analysis of a stage-structured predator prey system with birth pulse and impulsive harvesting at different moments. Nonlinear Anal. RWA 12, 2232–2244 (2011)
5. Jury, E.I.: Inners and Stability of Dynamic Systems. Wiley, New York (1974)