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Literature Cited
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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 14, No. 6, pp. 1259–1265, November–December, 1973.
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Leonov, G.A. Frequency conditions for the existence of nontrivial periodic solutions in autonomous systems. Sib Math J 14, 884–889 (1973). https://doi.org/10.1007/BF00975894
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DOI: https://doi.org/10.1007/BF00975894