@article{DAN_1976_226_4_a10,
     author = {L. A. Sakhnovich},
     title = {On the factorization of an operator-valued transfer function},
     journal = {Doklady Akademii Nauk},
     pages = {781--784},
     publisher = {mathdoc},
     volume = {226},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_226_4_a10/}
}