@article{ZVMMF_1990_30_6_a0,
     author = {A. P. Buslaev},
     title = {Non-linear spectra of matrices and extremal problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {803--816},
     publisher = {mathdoc},
     volume = {30},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1990_30_6_a0/}
}