@article{DE_1983_19_12_a5,
     author = {A. G. Surkov},
     title = {Exact lower and upper bounds of the highest and lowest characteristic exponents of a two-dimensional system with bounded perturbations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2065--2071},
     publisher = {mathdoc},
     volume = {19},
     number = {12},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_12_a5/}
}