\Bibitem{PacSte88} \by N.~L.~Pachulia, A.~I.~Stepanets \paper Strong summability of Fourier series on classes of $(\psi,\beta)$-differentiable functions \jour Mat. Zametki \yr 1988 \vol 44 \issue 4 \pages 506--516 \mathnet{http://mi.mathnet.ru/mzm4239} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=975190} \zmath{https://zbmath.org/?q=an:0663.42010|0712.42012} \transl \jour Math. Notes \yr 1988 \vol 44 \issue 4 \pages 758--764 \crossref{https://doi.org/10.1007/BF01158920} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1988U847500020}