@article{DAN_1984_278_2_a8,
     author = {V. D. Stepanov},
     title = {On a problem of {Halmos} and {Sunder}},
     journal = {Doklady Akademii Nauk},
     pages = {296--298},
     publisher = {mathdoc},
     volume = {278},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_278_2_a8/}
}