TY - JOUR AU - Jens Peter Reus Christensen TI - Necessary and Sufficient Conditions for the Measurability of Certain Sets of Closed Subsets. JO - Mathematische Annalen PY - 1973 SP - 189 EP - 194 VL - 200 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MAN_1973__200_162352/ ID - MAN_1973__200_162352 ER -