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Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 32, No. 3, pp. 39–46, May–June, 1991.
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Grebenev, V.N. A transformation of coordinates in a problem with a free boundary. Sib Math J 32, 383–389 (1991). https://doi.org/10.1007/BF00970473
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DOI: https://doi.org/10.1007/BF00970473