%0 Journal Article
%A Duke, Richard A.
%T The Genus, Regional Number, and Betti Number of a Graph
%J Canadian journal of mathematics
%D 1966
%P 817-822
%V 18
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-081-6/
%R 10.4153/CJM-1966-081-6
%F 10_4153_CJM_1966_081_6