@article{DAN_1975_222_3_a4,
     author = {P. A. Mishnaevskii},
     title = {Spectral theory for the {Sturm{\textendash}Liouville} equation with an operator coefficient},
     journal = {Doklady Akademii Nauk},
     pages = {534--537},
     year = {1975},
     volume = {222},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_222_3_a4/}
}