@article{MZM_1974_16_5_a15,
     author = {V. M. Bruk},
     title = {Some problems of the spectral theory of a~second-order differential equation with a~variable unbounded operator coefficient},
     journal = {Matemati\v{c}eskie zametki},
     pages = {813--822},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_5_a15/}
}