2 citations to https://www.mathnet.ru/rus/fpm991
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L. A. Kalyakin, “Capture and Keeping of a Resonance near Equilibrium”, Russ. J. Math. Phys., 26:2 (2019), 152
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Л. А. Калякин, “Асимптотический анализ моделей авторезонанса”, УМН, 63:5(383) (2008), 3–72 ; L. A. Kalyakin, “Asymptotic analysis of autoresonance models”, Russian Math. Surveys, 63:5 (2008), 791–857