%0 Journal Article
%A P. V. Yagodovskii
%T $\sigma$-Extensions of discrete multivalued groups
%J Zapiski Nauchnykh Seminarov POMI
%D 2005
%P 225-242
%V 325
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_2005_325_a12/
%G ru
%F ZNSL_2005_325_a12