@article{DAN_1989_306_4_a6,
     author = {N. A. Magnitskii},
     title = {The method of characteristic functions in stability theory},
     journal = {Doklady Akademii Nauk},
     pages = {799--802},
     year = {1989},
     volume = {306},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_4_a6/}
}