@article{ZNSL_2013_413_a10,
     author = {K. B. Tsvetkov},
     title = {Parabolic factorization for a~matrix ring},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {219--227},
     year = {2013},
     volume = {413},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2013_413_a10/}
}