TY  - JOUR
AU  - Bruen, A.
AU  - Fisher, J. C.
TI  - Spreads which are Not Dual Spreads
JO  - Canadian mathematical bulletin
PY  - 1969
SP  - 801
EP  - 803
VL  - 12
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-103-7/
DO  - 10.4153/CMB-1969-103-7
ID  - 10_4153_CMB_1969_103_7
ER  -