\Bibitem{Bus90} \by A.~P.~Buslaev \paper A~variational description of the spectra of totally positive matrices, and extremal problems of approximation theory \jour Mat. Zametki \yr 1990 \vol 47 \issue 1 \pages 39--46 \mathnet{http://mi.mathnet.ru/mzm3137} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=1048260} \zmath{https://zbmath.org/?q=an:0797.41021} \transl \jour Math. Notes \yr 1990 \vol 47 \issue 1 \pages 26--31 \crossref{https://doi.org/10.1007/BF01157280} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1990EA94100004}