@article{TIMM_2013_19_4_a28,
     author = {A. G. Chentsov},
     title = {On the question of representation of ultrafilters and their application in extension constructions},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {289--307},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2013_19_4_a28/}
}