TY - JOUR AU - R. Heath TI - On open mappings and certain spaces satisfying the first countability axiom JO - Fundamenta Mathematicae PY - 1965 SP - 91 EP - 96 VL - 57 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-57-1-91-96/ DO - 10.4064/fm-57-1-91-96 LA - en ID - 10_4064_fm_57_1_91_96 ER -