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Institute of High Energy Physics, Serpukhov. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 51, No. 1, pp. 10–21, April, 1982.
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Leznov, A.N., Smirnov, V.G. & Shabat, A.B. The group of internal symmetries and the conditions of integrability of two-dimensional dynamical systems. Theor Math Phys 51, 322–330 (1982). https://doi.org/10.1007/BF01029257
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DOI: https://doi.org/10.1007/BF01029257