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[en] We obtain necessary conditions for a bounded function φ to be a Fourier multiplier of weak type (ψ(L)(G),ψ(L)(G)), where G=Rd or G=Td, provided that the Young function ψ(t) grows slower than t ln1/2 t as t tends to infinity
Journal
Izvestiya. Mathematics; ISSN 1064-5632; 
; v. 71(1); p. 75-95
; v. 71(1); p. 75-95