%0 Journal Article
%A McCool, James
%T The Coherence Number of 2-Groups
%J Canadian mathematical bulletin
%D 1990
%P 503-508
%V 33
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1990-080-1/
%R 10.4153/CMB-1990-080-1
%F 10_4153_CMB_1990_080_1