@article{AA_2012_24_5_a4,
     author = {A. V. Lavrenov},
     title = {Unitary {Steinberg} group is centrally closed},
     journal = {Algebra i analiz},
     pages = {124--140},
     publisher = {mathdoc},
     volume = {24},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2012_24_5_a4/}
}