@article{FAA_1978_12_4_a11,
     author = {N. M. Kostenko},
     title = {A necessary and sufficient condition for the factorization of a rational operator-function},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {87--88},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1978_12_4_a11/}
}