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Physics Institute, Academy of Sciences of the USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 25, No. 2, pp. 83–85, April–June, 1991.
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Kravchenko, O.S., Khesin, B.A. A central extension of the algebra of pseudodifferential symbols. Funct Anal Its Appl 25, 152–154 (1991). https://doi.org/10.1007/BF01079603
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DOI: https://doi.org/10.1007/BF01079603