%0 Journal Article
%A A. M. Vinogradov
%T On the second obstruction to cross-sections
%J Doklady Akademii Nauk
%D 1960
%P 723-725
%V 130
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1960_130_4_a1/
%G ru
%F DAN_1960_130_4_a1