A qualitative investigation of stable first-order differential equations with variable retardation
Izvestiya. Mathematics , Tome 4 (1970) no. 1, pp. 159-178.

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The article is devoted to several theorems concerning the comparison of solutions (§ 2); the theorems yield conditions for boundedness (§ 3), tendency to zero, and stability of the trivial solution (§ 4); positive solutions are identified (§ 5), equations with a constant retardation are studied (§ 6), and the asymptotic behavior of the solutions is investigated (§ 7).
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V. G. Limanskii. A qualitative investigation of stable first-order differential equations with variable retardation. Izvestiya. Mathematics , Tome 4 (1970) no. 1, pp. 159-178. http://geodesic.mathdoc.fr/item/IM2_1970_4_1_a8/

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