@article{MZM_2001_70_4_a8,
     author = {R. S. Ismagilov and Sh. Sh. Sultanov},
     title = {Spectral {Analysis} of {Certain} {Self-Adjoint} {Differential} {Operators} in a {Space} with {Indefinite} {Metric}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {568--580},
     publisher = {mathdoc},
     volume = {70},
     number = {4},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_70_4_a8/}
}