TY - JOUR AU - S. Görnemann TI - A problem of Halmos on projective Boolean algebras JO - Colloquium Mathematicum PY - 1972 SP - 191 EP - 200 VL - 25 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-25-2-191-200/ DO - 10.4064/cm-25-2-191-200 LA - en ID - 10_4064_cm_25_2_191_200 ER -