@article{MZM_1970_7_4_a14,
     author = {A. G. Aslanyan and V. B. Lidskii},
     title = {Spectrum of an elliptic equation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {495--502},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_4_a14/}
}