@article{MZM_1994_55_6_a0,
     author = {T. Ya. Azizov and V. L. Khatskevich},
     title = {On self-adjoint operators connected by inequalities and on their applications to problems of mathematical physics},
     journal = {Matemati\v{c}eskie zametki},
     pages = {3--12},
     publisher = {mathdoc},
     volume = {55},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_55_6_a0/}
}