@article{ZVMMF_2000_40_7_a2,
     author = {S. K. Godunov and Yu. M. Nechepurenko},
     title = {On the annular separation of a matrix spectrum},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {980--985},
     publisher = {mathdoc},
     volume = {40},
     number = {7},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2000_40_7_a2/}
}