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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 4, pp. 810–819, July–August, 1975.
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Rakovskchik, L.S. Certain properties of extendable subspaces. Sib Math J 16, 620–627 (1975). https://doi.org/10.1007/BF00967136
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DOI: https://doi.org/10.1007/BF00967136