@article{DE_1994_30_10_a4,
     author = {S. N. Popova and E. L. Tonkov},
     title = {Control of {Lyapunov} exponents of compatible systems. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1687--1696},
     publisher = {mathdoc},
     volume = {30},
     number = {10},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_10_a4/}
}