%0 Journal Article
%A N. V. Efimov
%T The impossibility in Euclidean $3$-space of a complete regular surface with a negative upper bound of the Gaussian curvature
%J Doklady Akademii Nauk
%D 1963
%P 1206-1209
%V 150
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_150_6_a4/
%G ru
%F DAN_1963_150_6_a4