@article{VSPUI_2019_15_4_a2,
     author = {V. S. Ermolin and T. V. Vlasova},
     title = {Lyapunov's first method: estimates of characteristic numbers of functional matrices},
     journal = {Vestnik Sankt-Peterburgskogo universiteta. Prikladna\^a matematika, informatika, processy upravleni\^a},
     pages = {442--456},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VSPUI_2019_15_4_a2/}
}