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Translated from Matematicheskie Zametki, Vol. 1, No. 5, pp. 605–610, May, 1967.
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Shmul'yan, Y.L. Two-sided division in a ring of operators. Mathematical Notes of the Academy of Sciences of the USSR 1, 400–403 (1967). https://doi.org/10.1007/BF01094080
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DOI: https://doi.org/10.1007/BF01094080