%0 Journal Article
%A K. A. Mikhailova
%T The entrance problem for direct unions of groups
%J Doklady Akademii Nauk
%D 1958
%P 1103-1105
%V 119
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_119_6_a11/
%G ru
%F DAN_1958_119_6_a11