@article{MZM_1980_28_3_a13,
     author = {N. A. Izobov},
     title = {On the theory of characteristic {Lyapunov} exponents of linear and quasilinear differential systems},
     journal = {Matemati\v{c}eskie zametki},
     pages = {459--476},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_28_3_a13/}
}