%0 Journal Article %A H. Render %T Extreme positive operators on involution algebras %J Colloquium Mathematicum %D 1990 %P 81-96 %V 59 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-59-1-81-96/ %R 10.4064/cm-59-1-81-96 %G en %F 10_4064_cm_59_1_81_96