%0 Journal Article
%A N. V. Efimov
%T Qualitative problems of the theory of deformations of surfaces in the small
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1949
%P 3-128
%V 30
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1949_30_a0/
%G ru
%F TM_1949_30_a0