@article{SM_1981_40_3_a4,
     author = {G. V. Radzievskii},
     title = {Asymptotics of the distribution of the characteristic numbers of operator-valued functions analytic in an angle},
     journal = {Sbornik. Mathematics},
     pages = {363--385},
     year = {1981},
     volume = {40},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1981_40_3_a4/}
}