%0 Journal Article
%A A. D. Aleksandrov
%A A. V. Pogorelov
%T Nikolay Vladimirovich Efimov (on the occasion of his fiftieth birthday)
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1960
%V 15
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1960_15_6_a13/
%G ru
%F RM_1960_15_6_a13