TY - JOUR AU - A. G. Chentsov TI - Ultrafilters of measurable spaces as generalized solutions in abstract attainability problems JO - Trudy Instituta matematiki i mehaniki PY - 2011 SP - 268 EP - 293 VL - 17 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TIMM_2011_17_1_a22/ LA - ru ID - TIMM_2011_17_1_a22 ER -