\Bibitem{Fag51} \by M.~K.~Fage \paper On symmetrizable matrices \jour Russian Math. Surveys \yr 1951 \vol 6 \issue 3 \mathnet{http://mi.mathnet.ru/eng/rm6858} \mathscinet{https://mathscinet.ams.org/mathscinet-getitem?mr=43062} \zmath{https://zbmath.org/?q=an:0043.01303}