%0 Journal Article
%A Synge, J. L.
%T Two Isomorphs of the Four-Colour Problem
%J Canadian journal of mathematics
%D 1967
%P 1084-1091
%V 19
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-099-6/
%R 10.4153/CJM-1967-099-6
%F 10_4153_CJM_1967_099_6