TY - JOUR AU - W. Waliszewski TI - On the tagency of sets in a metric space JO - Colloquium Mathematicum PY - 1966 SP - 129 EP - 133 VL - 15 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-15-1-129-133/ DO - 10.4064/cm-15-1-129-133 LA - en ID - 10_4064_cm_15_1_129_133 ER -