Geodesic
Properties of solutions of a class of equations with lag which describe the dynamics of change in the population of a species with the age structure taken into account
Sbornik. Mathematics, Tome 45 (1983) no. 1, pp. 91-100 Cet article a éte moissonné depuis la source Math-Net.Ru

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The equation $$ \dot N=r\biggl[1-\dfrac{1}{K}\int_{h_1}^{h_2}H(s)N(t-s)\,ds\biggr]N, $$ generalizing the well-known Hutchinson equation, is used to describe the dynamics of change in the population of a species, with the age structure taken into account. Conditions are found for bifurcation of a periodic solution of this equation. The results obtained here are applied to explain some natural phenomena. Bibliography: 12 titles. 
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Yu. S. Kolesov. Properties of solutions of a class of equations with lag which describe the dynamics of change in the population of a species with the age structure taken into account. Sbornik. Mathematics, Tome 45 (1983) no. 1, pp. 91-100. http://geodesic.mathdoc.fr/item/SM_1983_45_1_a5/

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