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Additional information
St. Petersburg. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 40, No. 5, pp. 977–986, September–October, 1999.
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Aleksandrov, A.Y. On stability of the vector liénard equation with nonstationary perturbations. Sib Math J 40, 819–827 (1999). https://doi.org/10.1007/BF02674711
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DOI: https://doi.org/10.1007/BF02674711