%0 Journal Article %A A. G. Chentsov %T Ultrafilters of measurable spaces as generalized solutions in abstract attainability problems %J Trudy Instituta matematiki i mehaniki %D 2011 %P 268-293 %V 17 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMM_2011_17_1_a22/ %G ru %F TIMM_2011_17_1_a22