\Bibitem{Mai86} \by V.~E.~Maiorov \paper Trigonometric diameters of the Sobolev classes $W^r_p$ in the space $L_p$ \jour Mat. Zametki \yr 1986 \vol 40 \issue 2 \pages 161--173 \mathnet{http://mi.mathnet.ru/mzm5144} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=864281} \zmath{https://zbmath.org/?q=an:0623.41024} \transl \jour Math. Notes \yr 1986 \vol 40 \issue 2 \pages 590--597 \crossref{https://doi.org/10.1007/BF01159113} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1986G235400016}