@article{ZVMMF_1989_29_12_a0,
     author = {V. L. Druskin and L. A. Knizhnerman},
     title = {Two polynomial methods of calculating functions of symmetric matrices},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1763--1775},
     year = {1989},
     volume = {29},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1989_29_12_a0/}
}