@article{DE_1976_12_2_a5,
     author = {N. I. Kazeeva and S. N. Shimanov},
     title = {A theorem on critical cases of systems of difference equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {234--240},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_2_a5/}
}