\Bibitem{Ras53} \by P.~K.~Rashevskii \paper Veniamin Fedorovich Kagan (obituary) \jour Russian Math. Surveys \yr 1953 \vol 8 \issue 5 \mathnet{http://mi.mathnet.ru//eng/rm8244} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=59841} \zmath{https://zbmath.org/?q=an:0051.24311}