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Additional information
Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 1, No. 1, pp.1–14, January–March, 1967.
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Arnol'd, V.I. Characteristic class entering in quantization conditions. Funct Anal Its Appl 1, 1–13 (1967). https://doi.org/10.1007/BF01075861
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DOI: https://doi.org/10.1007/BF01075861