@article{DAN_1969_186_5_a11,
     author = {V. A. Yakubovich},
     title = {A certain class of nonlinear differential equations for which stability in the large and instability questions can be solved effectively},
     journal = {Doklady Akademii Nauk},
     pages = {1027--1030},
     publisher = {mathdoc},
     volume = {186},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_186_5_a11/}
}