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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 38, No. 5, pp. 605–618, September–October, 1986.
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Samoilenko, A.M. Smoothness in the parameter of an invariant torus of a quasilinear system of differential equations. Ukr Math J 38, 516–527 (1986). https://doi.org/10.1007/BF01060944
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DOI: https://doi.org/10.1007/BF01060944