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M. V. Lomonosov Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 22, No. 2, pp. 1–13, April–June, 1988.
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Veselov, A.P. Integrable discrete-time systems and difference operators. Funct Anal Its Appl 22, 83–93 (1988). https://doi.org/10.1007/BF01077598
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DOI: https://doi.org/10.1007/BF01077598