\Bibitem{Vin18} \by O.~L.~Vinogradov \paper Sharp constants for approximations of convolution classes with an integrable kernel by spaces of shifts \jour Algebra i Analiz \yr 2018 \vol 30 \issue 5 \pages 112--148 \mathnet{http://mi.mathnet.ru/aa1616} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=3856103} \elib{https://elibrary.ru/item.asp?id=41623006} \transl \jour St. Petersburg Math. J. \yr 2019 \vol 30 \issue 5 \pages 841--867 \crossref{https://doi.org/10.1090/spmj/1572} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=000477770800004} \scopus{https://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85070547867}