%0 Journal Article
%A Coxeter, H. S. M.
%T Parallel Lines
%J Canadian mathematical bulletin
%D 1978
%P 385-397
%V 21
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-069-9/
%R 10.4153/CMB-1978-069-9
%F 10_4153_CMB_1978_069_9