\Bibitem{KriNov89} \by I.~M.~Krichever, S.~P.~Novikov \paper Algebras of virasoro type, energy-momentum tensor, and decomposition operators on Riemann surfaces \jour Funktsional. Anal. i Prilozhen. \yr 1989 \vol 23 \issue 1 \pages 24--40 \mathnet{http://mi.mathnet.ru/faa993} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=998426} \zmath{https://zbmath.org/?q=an:0684.17012} \transl \jour Funct. Anal. Appl. \yr 1989 \vol 23 \issue 1 \pages 19--33 \crossref{https://doi.org/10.1007/BF01078570} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1989AL27000003}