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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 1, pp. 87–92, January–February, 1987.
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Prikarpatskii, A.K. Elements of the integrability theory of discrete dynamical systems. Ukr Math J 39, 73–77 (1987). https://doi.org/10.1007/BF01056428
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DOI: https://doi.org/10.1007/BF01056428