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Additional information
Institute of Hydrodynamics, Siberian Branch, Academy of Sciences of the USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 14, No. 1, pp. 25–36, January–March, 1980.
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Ibragimov, N.K., Shabat, A.B. Evolutionary equations with nontrivial Lie - Bäcklund group. Funct Anal Its Appl 14, 19–28 (1980). https://doi.org/10.1007/BF01078410
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DOI: https://doi.org/10.1007/BF01078410