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Translated from Matematicheskie Zametiki, Vol. 50, No. 5, pp. 32–42, November, 1991.
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Kalyakin, L.A. Asymptotics of an integral that arises in the theory of perturbations of KdV solitons. Mathematical Notes of the Academy of Sciences of the USSR 50, 1114–1122 (1991). https://doi.org/10.1007/BF01157696
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DOI: https://doi.org/10.1007/BF01157696