\Bibitem{Bik89} \by R.~F.~Bikbaev \paper Korteweg--de Vries equation with finite-gap boundary conditions, and the Whitham deformations of Riemann surfaces \jour Funktsional. Anal. i Prilozhen. \yr 1989 \vol 23 \issue 4 \pages 1--10 \mathnet{http://mi.mathnet.ru/faa1063} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=1035370} \zmath{https://zbmath.org/?q=an:0716.35073} \transl \jour Funct. Anal. Appl. \yr 1989 \vol 23 \issue 4 \pages 257--266 \crossref{https://doi.org/10.1007/BF01078940} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1989EH38600001}