%0 Journal Article
%A Tutte, W.T.
%T On the Colourings of Graphs
%J Canadian mathematical bulletin
%D 1961
%P 157-160
%V 4
%N 2
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1961-019-4/
%R 10.4153/CMB-1961-019-4
%F 10_4153_CMB_1961_019_4