@article{ZVMMF_1991_31_7_a3,
     author = {V. L. Druskin and L. A. Knizhnerman},
     title = {Error bounds in the simple {Lanczos} procedure for computing functions of},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {970--983},
     publisher = {mathdoc},
     volume = {31},
     number = {7},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1991_31_7_a3/}
}