\Bibitem{Asa80} \by G.~S.~Asanov \paper $C$-reducible Finsler spaces. Finsler spaces with Randers' metric and Kropina metric \serial Itogi Nauki i Tekhniki. Ser. Probl. Geom. \yr 1980 \vol 11 \pages 65--88 \publ VINITI \publaddr Moscow \mathnet{http://mi.mathnet.ru/intg120} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=579928} \zmath{https://zbmath.org/?q=an:0461.53037|0454.53041} \transl \jour J. Soviet Math. \yr 1981 \vol 17 \issue 1 \pages 1610--1624 \crossref{https://doi.org/10.1007/BF01084593}