%0 Journal Article %A W. Zawadowski %T On regular extensions of operator systems. %J Fundamenta Mathematicae %D 1964 %P 107-113 %V 56 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-56-1-107-113/ %R 10.4064/fm-56-1-107-113 %G en %F 10_4064_fm_56_1_107_113