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The results in this paper are extensions of those submitted in a Technical Report prepared under contract DA-04-200-ORD-171 for the Office of Ordnance Research, U.S. Army, (1955) under the supervision of F.Wolf.
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Butler, J. Perturbation series for eigenvalues of Analytic Non-symmetric Operators. Arch. Math 10, 21–27 (1959). https://doi.org/10.1007/BF01240753
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DOI: https://doi.org/10.1007/BF01240753