@article{ZVMMF_2005_45_3_a3,
     author = {A. N. Malyshev and M. Sadkane},
     title = {First-order perturbation theory for the symmetric lanczos algorithm},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {391--399},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2005_45_3_a3/}
}