%0 Journal Article
%A Hemminger, Robert L.
%T On the Group of a Directed Graph
%J Canadian journal of mathematics
%D 1966
%P 211-220
%V 18
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-023-2/
%R 10.4153/CJM-1966-023-2
%F 10_4153_CJM_1966_023_2