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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 12, No. 2, pp. 442–451, March–April, 1971.
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Shmul'yan, Y.L. On operator R-functions. Sib Math J 12, 315–322 (1971). https://doi.org/10.1007/BF00969054
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DOI: https://doi.org/10.1007/BF00969054