@article{MZM_1990_47_3_a16,
     author = {K. Kh. Boimatov and A. G. Kostyuchenko},
     title = {Spectral asymptotics of polynomial pencils of differential operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {129--130},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_3_a16/}
}