@article{DE_1981_17_11_a4,
     author = {N. A. Izobov and T. E. Zvereva},
     title = {The spectrum of characteristic exponents of a two-dimensional stationary system with perturbations-rotations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1964--1977},
     publisher = {mathdoc},
     volume = {17},
     number = {11},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_11_a4/}
}