@article{RM_1997_52_1_a6,
     author = {S. P. Novikov},
     title = {Algebraic properties of two-dimensional difference operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {226--227},
     publisher = {mathdoc},
     volume = {52},
     number = {1},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1997_52_1_a6/}
}