@article{DAN_1986_290_2_a3,
     author = {J. Bu\v{s}a},
     title = {Singular values of perturbed matrices},
     journal = {Doklady Akademii Nauk},
     pages = {275--277},
     publisher = {mathdoc},
     volume = {290},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_290_2_a3/}
}