@article{TVP_1964_9_2_a19,
     author = {Yu. L. \v{S}mul'yan},
     title = {Optimum {Factorization} of the {Non-negative} {Matrix} {Functions}},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {382--386},
     year = {1964},
     volume = {9},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1964_9_2_a19/}
}