%0 Journal Article %A A. G. Chentsov %T Closed Mappings and Construction of Extension Models %J Trudy Instituta matematiki i mehaniki %D 2023 %P 274-295 %V 29 %N 3 %U http://geodesic.mathdoc.fr/item/TIMM_2023_29_3_a16/ %G ru %F TIMM_2023_29_3_a16