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Additional information
Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 6, No. 2, pp. 12–20, April–June, 1972.
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Arnol'd, V.I. Modes and quasimodes. Funct Anal Its Appl 6, 94–101 (1972). https://doi.org/10.1007/BF01077511
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DOI: https://doi.org/10.1007/BF01077511