\Bibitem{Kir87} \by A.~A.~Kirillov \paper K\"ahler structures on $K$-orbits of the group of diffeomorphisms of a circle \jour Funktsional. Anal. i Prilozhen. \yr 1987 \vol 21 \issue 2 \pages 42--45 \mathnet{http://mi.mathnet.ru/faa1189} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=902292} \zmath{https://zbmath.org/?q=an:0647.58010} \transl \jour Funct. Anal. Appl. \yr 1987 \vol 21 \issue 2 \pages 122--125 \crossref{https://doi.org/10.1007/BF01078025} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1987L104500004}