@article{ZNSL_2017_460_a5,
     author = {V. I. Kopeiko},
     title = {Bass' nilpotent unitary $K_1$-group of unitary ring},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {134--157},
     year = {2017},
     volume = {460},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2017_460_a5/}
}