@article{SM_1985_52_1_a13,
     author = {S. Z. Levendorskii},
     title = {Asymptotics of the spectrum of linear operator pencils},
     journal = {Sbornik. Mathematics},
     pages = {245--266},
     publisher = {mathdoc},
     volume = {52},
     number = {1},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1985_52_1_a13/}
}