TY - JOUR AU - Roman Pol TI - On category-raising and dimension-raising open mappings with discrete fibers JO - Colloquium Mathematicum PY - 1981 SP - 65 EP - 76 VL - 44 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-44-1-65-76/ DO - 10.4064/cm-44-1-65-76 LA - en ID - 10_4064_cm_44_1_65_76 ER -