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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 36, No. 4, pp. 421–427, July–August, 1984.
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Bondarchuk, V.S. Morse index and deformations of Hamiltonian systems. Ukr Math J 36, 338–343 (1984). https://doi.org/10.1007/BF01066550
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DOI: https://doi.org/10.1007/BF01066550