%0 Journal Article
%A O. Ya. Viro
%T Two-sheeted branched coverings of the three-dimensional sphere
%J Zapiski Nauchnykh Seminarov POMI
%D 1973
%P 6-39
%V 36
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1973_36_a1/
%G ru
%F ZNSL_1973_36_a1