@article{DE_1975_11_8_a12,
     author = {D. I. Martynyuk},
     title = {An investigation of the neighborhood of an invariant toroidal manifold of a system of difference equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1474--1484},
     publisher = {mathdoc},
     volume = {11},
     number = {8},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_8_a12/}
}