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Kazan State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 62, No. 1, pp. 144–152, January, 1985.
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Ivanov, G.G. Polynomial conservation laws and exact solutions associated with isometric and homothetic symmetries in the nonlinear sigma model. Theor Math Phys 62, 95–101 (1985). https://doi.org/10.1007/BF01034831
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DOI: https://doi.org/10.1007/BF01034831