%0 Journal Article %A Klee, Victor %T On a Question of Colin Clark Concerning Three Properties of Convex Sets(1) %J Canadian mathematical bulletin %D 1972 %P 535-537 %V 15 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-094-9/ %R 10.4153/CMB-1972-094-9 %F 10_4153_CMB_1972_094_9