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3. Andronov, A.A., Vitt, A.A., Khaikin, S.E.: Theory of Oscillators. Nauka, Moscow (1959). Translated into English: Pergamon Press, Oxford (1966)
4. Andronov, A.A., Leontovich, E.A., Gordon, I.I., Mayer, A.G.: Theory of Bifurcations of Dynamic Systems on a Plane. Nauka, Moscow (1967). Translated into English: Wiley, New York (1973)
5. Anishchenko, V.S.: Attractors of dynamical systems. Izvestiya VUZ. Applied Nonlinear Dynamics (ISSN 0869-6632). 5(1), 109–127, (in Russian) (1997)