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Original Russian Text © M.V. Kuznetsov, 2018, published in Matematicheskie Zametki, 2018, Vol. 104, No. 1, pp. 154–157.
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Kuznetsov, M.V. A Characteristic of Closed Nondegenerate Curves. Math Notes 104, 156–158 (2018). https://doi.org/10.1134/S0001434618070167
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DOI: https://doi.org/10.1134/S0001434618070167