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Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta, im. V. A. Steklova AN SSSR, Vol. 44, pp. 131–178, 1974.
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Van Feu, D. Extension of Goluzin's variational formula to an annulus. J Math Sci 8, 738–780 (1977). https://doi.org/10.1007/BF01084045
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DOI: https://doi.org/10.1007/BF01084045