%0 Journal Article
%A N. V. Efimov
%A È. G. Poznyak
%T Generalization of Hilbert's theorem on surfaces of constant negative curvature
%J Doklady Akademii Nauk
%D 1961
%P 509-512
%V 137
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_137_3_a4/
%G ru
%F DAN_1961_137_3_a4