TY - JOUR AU - D.Z. Djokovic TI - A Problem of Mapping a Finite Set into a Set of Positive Measure JO - Commentarii mathematici Helvetici PY - 1971 SP - 137 EP - 140 VL - 46 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMH_1971__46_139468/ ID - CMH_1971__46_139468 ER -