%0 Journal Article
%A Alltop, W. O.
%T Free Planes and Collineations
%J Canadian journal of mathematics
%D 1968
%P 1397-1411
%V 20
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-141-2/
%R 10.4153/CJM-1968-141-2
%F 10_4153_CJM_1968_141_2