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The work of the third author was supported in part by the Netherlands Organization for the Advancement of Pure Research (Z.W.O.), 1973, ref. No. 7357a.
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Bart, H., Kaashoek, M.A. & Lay, D.C. Relative inverses of meromorphic operator functions and associated holomorphic projection functions. Math. Ann. 218, 199–210 (1975). https://doi.org/10.1007/BF01349694
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DOI: https://doi.org/10.1007/BF01349694