%0 Journal Article
%A Bowen, Robert
%T On Sums of Valencies in Planar Graphs
%J Canadian mathematical bulletin
%D 1966
%P 111-114
%V 9
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1966-016-x/
%R 10.4153/CMB-1966-016-x
%F 10_4153_CMB_1966_016_x