Geodesic
A Periodic Lotka-Volterra System
Serdica Mathematical Journal, Tome 22 (1996) no. 2, pp. 109-116.

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In this paper periodic time-dependent Lotka-Volterra systems are considered. It is shown that such a system has positive periodic solutions. It is done without constructive conditions over the period and the parameters.
Keywords: Periodic Lotka-Volterra System Predator-Prey 
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Tsvetkov, D. A Periodic Lotka-Volterra System. Serdica Mathematical Journal, Tome 22 (1996) no. 2, pp. 109-116. http://geodesic.mathdoc.fr/item/SMJ2_1996_22_2_a3/