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M. V. Lomonosov Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 24, No. 1, pp. 38–47, January–March, 1990.
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Ovsienko, V.Y., Khesin, B.A. Symplectic leaves of the Gel'fand-Dikii brackets and homotopy classes of nondegenerate curves. Funct Anal Its Appl 24, 33–40 (1990). https://doi.org/10.1007/BF01077916
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DOI: https://doi.org/10.1007/BF01077916