%0 Journal Article %A Jaime Rodríguez Montes %T Extreme points of numerical ranges of quasihyponormal operators %J Revista colombiana de matematicas %D 1993 %P 223-230 %V 27 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RCM_1993__27_1-2_181884/ %F RCM_1993__27_1-2_181884