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G. M. Krzhizhanovskii Energy Institute. L. D. Landau Institute of Theoretical Physics. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 21, No. 2, pp. 46–63, April–June, 1987.
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Krichever, I.M., Novikov, S.P. Algebras of virasoro type, riemann surfaces and structures of the theory of solitons. Funct Anal Its Appl 21, 126–142 (1987). https://doi.org/10.1007/BF01078026
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DOI: https://doi.org/10.1007/BF01078026