%0 Journal Article %A Lutz Heindorf %T Boolean semigroup rings and exponentials of compact zero-dimensional spaces %J Fundamenta Mathematicae %D 1990 %P 37-47 %V 135 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-135-1-37-47/ %R 10.4064/fm-135-1-37-47 %G en %F 10_4064_fm_135_1_37_47