\Bibitem{NikLiz87} \by S.~M.~Nikol'skii, P.~I.~Lizorkin \paper Functional spaces on the sphere, related with approximation theory \jour Mat. Zametki \yr 1987 \vol 41 \issue 4 \pages 509--516 \mathnet{http://mi.mathnet.ru/mzm4872} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=897694} \zmath{https://zbmath.org/?q=an:0656.42002} \transl \jour Math. Notes \yr 1987 \vol 41 \issue 4 \pages 286--291 \crossref{https://doi.org/10.1007/BF01137674} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1987L342500027}