%0 Journal Article
%A R. A. DeMarr
%T Transformations in semi-groups and multi-valued mappings
%J Doklady Akademii Nauk
%D 1962
%P 968-970
%V 144
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1962_144_5_a5/
%G ru
%F DAN_1962_144_5_a5