@article{DE_1977_13_6_a5,
     author = {G. S. Krechetov},
     title = {Some properties of {Ljapunov} functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1020--1025},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_6_a5/}
}