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Александр Олегович Игнатьев, Alexander Olegovich Ignatyev, Владимир Васильевич Кириченко, Vladimir Vasil'evich Kirichenko. "О необходимых условиях глобальной асимптотической устойчивости положения равновесия уравнения Льенара." Математические заметки 93.1 (2013) 63-71