@article{DAN_1988_301_2_a4,
     author = {A. I. Zhilyaev},
     title = {Some spectral properties of the {Bessel} differential operator},
     journal = {Doklady Akademii Nauk},
     pages = {278--280},
     publisher = {mathdoc},
     volume = {301},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_301_2_a4/}
}