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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 3, pp. 348–359, May–June, 1975.
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Samoilenko, A.M., Kulik, V.L. On the existence of the Green function of the problem of the invariant torus. Ukr Math J 27, 279–288 (1975). https://doi.org/10.1007/BF01092085
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DOI: https://doi.org/10.1007/BF01092085