@article{DAN_1993_331_4_a9,
     author = {A. M. Kerbelev},
     title = {A frequency criterion for the robust stability of linear},
     journal = {Doklady Akademii Nauk},
     pages = {419--420},
     year = {1993},
     volume = {331},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_4_a9/}
}