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Institute of Applied Mathematics, Academy of Sciences of the USSR. Institute of Chemical Physics, Academy of Sciences of the USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 13, No. 4, pp. 13–30, October–December, 1979.
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Gel'fand, I.M., Dorfman, I.Y. Hamiltonian operators and algebraic structures related to them. Funct Anal Its Appl 13, 248–262 (1979). https://doi.org/10.1007/BF01078363
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DOI: https://doi.org/10.1007/BF01078363