@article{IIMI_2017_49_a2,
     author = {A. G. Chentsov},
     title = {Superextension as bitopological space},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {55--79},
     year = {2017},
     volume = {49},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2017_49_a2/}
}