@article{IVM_1991_5_a3,
     author = {B. S. Kochkarev},
     title = {Generalized-actual systems of matrices},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {22--25},
     year = {1991},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_5_a3/}
}