@article{VSPUI_2014_2_a4,
     author = {V. S. Ermolin},
     title = {Invariant transformations in the first method of {Lyapunov}},
     journal = {Vestnik Sankt-Peterburgskogo universiteta. Prikladna\^a matematika, informatika, processy upravleni\^a},
     pages = {36--48},
     year = {2014},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSPUI_2014_2_a4/}
}