@article{ZVMMF_2008_48_7_a1,
     author = {S. K. Godunov and A. N. Malyshev},
     title = {On a~special basis of approximate eigenvectors with local supports for an isolated narrow cluster of eigenvalues of a~symmetric tridiagonal matrix},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1156--1166},
     year = {2008},
     volume = {48},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2008_48_7_a1/}
}