\Bibitem{Nov89} \by M.~V.~Novitskii \paper Bilateral estimates of polynomial conservation laws for the KdV equation and their applications \jour Funktsional. Anal. i Prilozhen. \yr 1989 \vol 23 \issue 3 \pages 78--79 \mathnet{http://mi.mathnet.ru/faa1055} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=1026999} \zmath{https://zbmath.org/?q=an:0699.35224|0709.35093} \transl \jour Funct. Anal. Appl. \yr 1989 \vol 23 \issue 3 \pages 238--240 \crossref{https://doi.org/10.1007/BF01079538} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1989EF94000017}