@article{DE_1978_14_2_a2,
     author = {Yu. A. Kuznetsov and E. F. Sabaev},
     title = {Estimates of the solutions of nonlinear differential equations in a phase space, and the stability of invariant sets},
     journal = {Differencialʹnye uravneni\^a},
     pages = {212--222},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_2_a2/}
}