@article{DAN_1989_305_1_a9,
     author = {A. A. Martynyuk},
     title = {The {Lyapunov} hierarchical matrix function and stability under},
     journal = {Doklady Akademii Nauk},
     pages = {41--44},
     publisher = {mathdoc},
     volume = {305},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_1_a9/}
}