@article{DAN_1993_333_3_a7,
     author = {E. E. Tyrtyshnikov},
     title = {New theorems on the distribution of eigenvalues and singular},
     journal = {Doklady Akademii Nauk},
     pages = {300--303},
     publisher = {mathdoc},
     volume = {333},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_333_3_a7/}
}