@article{DAN_1969_188_5_a4,
     author = {E. G. D'yakonov},
     title = {The solution of certain nonlinear systems of difference equations},
     journal = {Doklady Akademii Nauk},
     pages = {982--985},
     year = {1969},
     volume = {188},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_188_5_a4/}
}