@article{FAA_2009_43_1_a0,
     author = {V. E. Adler and A. I. Bobenko and Yu. B. Suris},
     title = {Discrete {Nonlinear} {Hyperbolic} {Equations.} {Classification} of {Integrable} {Cases}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {3--21},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2009_43_1_a0/}
}