%0 Journal Article
%A Yu. Lisitsa
%T The extension of mappings and a factorization theorem
%J Doklady Akademii Nauk
%D 1972
%P 1042-1043
%V 207
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a5/
%G ru
%F DAN_1972_207_5_a5