%0 Journal Article
%A V. G. Khalin
%A A. V. Yakovlev
%T Universal norms in $\Gamma$-extensions
%J Zapiski Nauchnykh Seminarov POMI
%D 1977
%P 251-255
%V 71
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1977_71_a16/
%G ru
%F ZNSL_1977_71_a16