@article{DAN_1987_293_2_a7,
     author = {I. Ya. Gol'dsheid and G. A. Margulis},
     title = {The condition of simplicity for the spectrum of {Lyapunov} exponents},
     journal = {Doklady Akademii Nauk},
     pages = {297--301},
     publisher = {mathdoc},
     volume = {293},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_2_a7/}
}