@article{DE_2003_39_6_a1,
     author = {T. S. Bykova and E. L. Tonkov},
     title = {Lyapunov {Reducibility} of a {Linear} {System} with {Aftereffect}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {731--737},
     publisher = {mathdoc},
     volume = {39},
     number = {6},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_6_a1/}
}