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Translated fromIssledovaniya po Prikladnoi Matematike, No. 19, 1992, pp. 81–89.
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Mokeichev, V.S. Perturbation theory in a nonselfadjoint special case. J Math Sci 74, 1255–1259 (1995). https://doi.org/10.1007/BF02367692
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DOI: https://doi.org/10.1007/BF02367692