@article{DE_2006_42_12_a2,
     author = {N. A. Izobov and R. A. Prokhorova},
     title = {On the {Lyapunov} characteristic exponents and lower {Perron} exponents of solutions of {Coppel--Conti} linear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1612--1625},
     publisher = {mathdoc},
     volume = {42},
     number = {12},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_12_a2/}
}