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Preobrazhenskaya È A
Publications in Math-Net.Ru
Operations which are obtainable by a combination of chains of
$(\mathfrak v)S_N$
-operations
Izv. Vyssh. Uchebn. Zaved. Mat.
, 1968, no. 10,
63–71
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Steklov Math. Inst. of RAS
, 2024