@article{ZVMMF_1994_34_2_a12,
     author = {S. A. Shishkin},
     title = {The extraction of the square roots of symmetric sign-indefinite matrices. {Polar} decomposition version},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {315--317},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1994_34_2_a12/}
}