@article{DE_1976_12_3_a2,
     author = {A. G. Alenizyn},
     title = {Asymptotic behavior of the spectrum of a {Sturm--Liouville} operator in the case of a limit circle},
     journal = {Differencialʹnye uravneni\^a},
     pages = {428--437},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_3_a2/}
}