@article{ZNSL_1980_103_a10,
     author = {S. L. Krupetskii},
     title = {On subgroups of unitary group over a~diadic local field},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {79--89},
     year = {1980},
     volume = {103},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_103_a10/}
}