@article{AA_1998_10_1_a8,
     author = {P. A. Shvartsman},
     title = {On the localization of spectra for the sum and product of matrices of certain classes},
     journal = {Algebra i analiz},
     pages = {202--247},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1998_10_1_a8/}
}