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Translated from Matematicheskie Zametki, Vol. 44, No. 1, pp. 134–144 July, 1988.
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Khor'kova, N.G. Conservation laws and nonlocal symmetries. Mathematical Notes of the Academy of Sciences of the USSR 44, 562–568 (1988). https://doi.org/10.1007/BF01158125
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DOI: https://doi.org/10.1007/BF01158125