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Existence of four positive periodic solutions for a ratio-dependent predator-prey system with multiple exploited (or harvesting) terms. (English) Zbl 1198.34081
The authors investigate a non-autonomous ratio-dependent predator-prey model with exploited terms. By using coincidence degree theory, they establish the existence of at least four positive periodic solutions for the above model. A related paper is {\it S. Chakraborty, S. Pal} and {\it N. Bairagi}, Nonlinear Anal., Real World Appl. 11, No. 3, 1862--1877 (2010; Zbl 1198.34077).

34C60Qualitative investigation and simulation of models (ODE)
92D25Population dynamics (general)
34C25Periodic solutions of ODE
47N20Applications of operator theory to differential and integral equations
Full Text: DOI
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