TY  - JOUR
AU  - Ahmad Shafaat
TI  - Boolean groupoids
JO  - Fundamenta Mathematicae
PY  - 1975
SP  - 117
EP  - 120
VL  - 88
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-88-2-117-120/
DO  - 10.4064/fm-88-2-117-120
LA  - fr
ID  - 10_4064_fm_88_2_117_120
ER  -