@article{DE_1970_6_7_a13,
     author = {S. G. Simonyan},
     title = {Asymptotics of the width of lacunae in the spectrum of a {Sturm{\textendash}Liouville} operator with periodic analytic potential},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1265--1272},
     year = {1970},
     volume = {6},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_7_a13/}
}