%0 Journal Article %A Davis, Elwyn H. %T Incidence Systems associated with Non-Planar Nearfields %J Canadian journal of mathematics %D 1970 %P 939-952 %V 22 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-108-1/ %R 10.4153/CJM-1970-108-1 %F 10_4153_CJM_1970_108_1