@article{DAN_1991_318_5_a13,
     author = {I. Dzh. Mardanov},
     title = {Reduction of a system of nonlinear difference equations in a},
     journal = {Doklady Akademii Nauk},
     pages = {1086--1088},
     publisher = {mathdoc},
     volume = {318},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_5_a13/}
}