\Bibitem{Lab82} \by L.~G.~Labsker \paper Korovkin sets in Banach space for sets of linear functionals \jour Mat. Zametki \yr 1982 \vol 31 \issue 1 \pages 93--112 \mathnet{http://mi.mathnet.ru/mzm6165} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=646916} \zmath{https://zbmath.org/?q=an:0495.41014} \transl \jour Math. Notes \yr 1982 \vol 31 \issue 1 \pages 47--56 \crossref{https://doi.org/10.1007/BF01146268} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1982PH20300010}