TY - JOUR AU - Lutz Heindorf TI - Boolean semigroup rings and exponentials of compact zero-dimensional spaces JO - Fundamenta Mathematicae PY - 1990 SP - 37 EP - 47 VL - 135 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-135-1-37-47/ DO - 10.4064/fm-135-1-37-47 LA - en ID - 10_4064_fm_135_1_37_47 ER -