@article{IIMI_2019_53_a11,
     author = {A. G. Chentsov},
     title = {Ultrafilters and maximal linked systems: basic relations},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {138--157},
     publisher = {mathdoc},
     volume = {53},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2019_53_a11/}
}