@article{IM2_1983_21_1_a4,
     author = {S. Z. Levendorskii},
     title = {Asymptotic distribution of eigenvalues},
     journal = {Izvestiya. Mathematics },
     pages = {119--160},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_21_1_a4/}
}