Geodesic
A special relaxation cycle of a system of differential-difference equations
Izvestiya. Mathematics , Tome 43 (1994) no. 3, pp. 607-616.

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The existence of a relaxation cycle with unusual properties is proved for a certain system with delay encountered in mathematical ecology. The theoretical result is applied to the explanation of a concrete natural phenomenon. 
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Yu. S. Kolesov. A special relaxation cycle of a system of differential-difference equations. Izvestiya. Mathematics , Tome 43 (1994) no. 3, pp. 607-616. http://geodesic.mathdoc.fr/item/IM2_1994_43_3_a11/

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