\Bibitem{Ale47} \by A.~D.~Aleksandrov \paper On the work of S.\,E.~Cohn-Vossen \jour Russian Math. Surveys \yr 1947 \vol 2 \issue 3 \mathnet{http://mi.mathnet.ru//eng/rm6958} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=24367}