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Additional information
Yaroslavl' State University. Translated from Matematicheskie Zametki, Vol. 56, No. 6, pp. 40–47, December, 1994.
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Kolesov, A.Y. On the existence and stability of a two-dimensional relaxational torus. Math Notes 56, 1238–1243 (1994). https://doi.org/10.1007/BF02266691
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DOI: https://doi.org/10.1007/BF02266691