@article{GDZPPN00248711X,
title = {Conjugate Connections and Radon's Theorem in Affine Differential Geometry.},
journal = {Monatshefte f\"ur Mathematik},
volume = {109},
year = {1990},
pages = {221-236},
zbl = {0712.53008},
url = {http://dml.mathdoc.fr/item/GDZPPN00248711X}
}
Dillen, F.; Nomizu, K.; Vranken, L. Conjugate Connections and Radon's Theorem in Affine Differential Geometry.. Monatshefte für Mathematik, Tome 109 (1990) pp. 221-236. http://gdmltest.u-ga.fr/item/GDZPPN00248711X/