@article{DAN_1975_225_6_a2,
     author = {A. G. Kamenskii},
     title = {Qualitative investigation of the spectra of differential-difference operators},
     journal = {Doklady Akademii Nauk},
     pages = {1249--1251},
     publisher = {mathdoc},
     volume = {225},
     number = {6},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_6_a2/}
}