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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 1, pp. 21–28, January–February, 1987.
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Gonchenko, S.V., Shil'nikov, L.P. Arithmetic properties of topological invariants of systems with nonstructurally-stable homoclinic trajectories. Ukr Math J 39, 15–21 (1987). https://doi.org/10.1007/BF01056417
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DOI: https://doi.org/10.1007/BF01056417