%0 Journal Article
%T The four-color problem, by Oystein Ore. Academic Press, New York, 1967. xv + 259 pages. $12.00.
%J Canadian mathematical bulletin
%D 1968
%P 161-163
%V 11
%N 1
%U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500028915/
%R 10.1017/S0008439500028915
%F 10_1017_S0008439500028915