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Kazan State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 57, No. 1, pp. 45–54, October, 1983.
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Ivanov, G.G. Symmetries, conservation laws, and exact solutions in nonlinear sigma models. Theor Math Phys 57, 981–987 (1983). https://doi.org/10.1007/BF01028173
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DOI: https://doi.org/10.1007/BF01028173