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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 5, pp. 1011–1019, September–October, 1975.
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Koledov, L.V. A constructive description of the domains of definition of fractional powers of elliptic operators. Sib Math J 16, 772–778 (1975). https://doi.org/10.1007/BF00967108
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DOI: https://doi.org/10.1007/BF00967108