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(I. Sh. Kalimullin) Supported by RFBR (project Nos. 15-41-02507 and 15-31-20607).
(M. Kh. Faizrakhmanov) Supported by RFBR (project Nos. 14-01-31158 and 15-01-08252).
Translated from Algebra i Logika, Vol. 54, No. 4, pp. 536–541, July-August, 2015.
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Kalimullin, I.S., Faizrakhmanov, M.K. A Hierarchy of Classes of Families and n-Low Degrees. Algebra Logic 54, 347–350 (2015). https://doi.org/10.1007/s10469-015-9355-4
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DOI: https://doi.org/10.1007/s10469-015-9355-4