@article{MZM_1999_65_6_a15,
     author = {N. F. Valeev and Ya. T. Sultanaev},
     title = {Spectral properties of the {Sturm--Liouville} operator in the space of vector functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {932--938},
     publisher = {mathdoc},
     volume = {65},
     number = {6},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a15/}
}