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Research partially supported by (U.S.) National Science Foundation. I also thank Statens Naturvetenskapliga Forskningsråd (Sweden) for further support, and the Institut Mittag-Leffler for its hospitality.
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Drasin, D. Proof of a conjecture of F. Nevanlinna concerning functions which have deficiency sum two. Acta Math 158, 1–94 (1987). https://doi.org/10.1007/BF02392256
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DOI: https://doi.org/10.1007/BF02392256