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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 2, pp. 167–182, March–April, 1975.
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Gurtovnik, A.S., Kogan, V.P. & Neimark, Y.I. Invariant toroidal manifolds and resonances in discrete dynamical systems. Ukr Math J 27, 132–143 (1975). https://doi.org/10.1007/BF01089994
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DOI: https://doi.org/10.1007/BF01089994