%0 Journal Article
%A Williams, Gordon
%T Petrie Schemes
%J Canadian journal of mathematics
%D 2005
%P 844-870
%V 57
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2005-033-6/
%R 10.4153/CJM-2005-033-6
%F 10_4153_CJM_2005_033_6