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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 17, No. 4, pp. 860–867, July–August, 1976.
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Pykh, Y.A. Qualitative investigation of a dynamical system. Sib Math J 17, 648–653 (1976). https://doi.org/10.1007/BF00971675
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DOI: https://doi.org/10.1007/BF00971675