%0 Journal Article %A Anna Zappa %T The center of an algebra of operators %J Colloquium Mathematicum %D 1978 %P 343-349 %V 39 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-39-2-343-349/ %R 10.4064/cm-39-2-343-349 %G en %F 10_4064_cm_39_2_343_349