@article{ZNSL_1972_28_a6,
     author = {A. V. Roiter},
     title = {Matrix problems and the representations of bisystems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {130--143},
     publisher = {mathdoc},
     volume = {28},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_28_a6/}
}