TY  - JOUR
AU  - Alltop, W. O.
TI  - Free Planes and Collineations
JO  - Canadian journal of mathematics
PY  - 1968
SP  - 1397
EP  - 1411
VL  - 20
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-141-2/
DO  - 10.4153/CJM-1968-141-2
ID  - 10_4153_CJM_1968_141_2
ER  -