@article{TIMM_1998_5_a9,
     author = {V. A. Gustomesov},
     title = {A classification of the difference linear systems of the second order},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {104--118},
     publisher = {mathdoc},
     volume = {5},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_1998_5_a9/}
}