@article{DAN_1985_280_5_a8,
     author = {A. A. Martynyuk},
     title = {On the {Lyapunov} matrix-function and stability of motions},
     journal = {Doklady Akademii Nauk},
     pages = {1062--1066},
     year = {1985},
     volume = {280},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_280_5_a8/}
}