@article{GDZPPN002476649,
title = {Generalizations of the Theorems of Radon, Helly, and Carath\'eodory.},
journal = {Monatshefte f\"ur Mathematik},
volume = {73},
year = {1969},
pages = {309-315},
zbl = {0179.50901},
url = {http://dml.mathdoc.fr/item/GDZPPN002476649}
}
Bryant, V.W.; Webster, R.J. Generalizations of the Theorems of Radon, Helly, and Carathéodory.. Monatshefte für Mathematik, Tome 73 (1969) pp. 309-315. http://gdmltest.u-ga.fr/item/GDZPPN002476649/