@article{DAN_1979_247_5_a14,
     author = {V. A. Babeshko},
     title = {An efficient method of approximate factorization of matrix functions},
     journal = {Doklady Akademii Nauk},
     pages = {1089--1093},
     year = {1979},
     volume = {247},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_5_a14/}
}