%0 Journal Article %T Numerical Range and Convex Sets* %J Canadian mathematical bulletin %D 1974 %P 295-296 %V 17 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-058-3/ %R 10.4153/CMB-1974-058-3 %F 10_4153_CMB_1974_058_3