TY  - JOUR
AU  - Duke, Richard A.
TI  - The Genus, Regional Number, and Betti Number of a Graph
JO  - Canadian journal of mathematics
PY  - 1966
SP  - 817
EP  - 822
VL  - 18
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-081-6/
DO  - 10.4153/CJM-1966-081-6
ID  - 10_4153_CJM_1966_081_6
ER  -