%0 Journal Article %A Katchalski, Meir %T A Helly type Theorem for Convex Sets %J Canadian mathematical bulletin %D 1978 %P 121-123 %V 21 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-021-5/ %R 10.4153/CMB-1978-021-5 %F 10_4153_CMB_1978_021_5