@article{MZM_1989_45_4_a2,
     author = {A. M. Dzhrbashyan},
     title = {Herglotz--Riesz type theorems},
     journal = {Matemati\v{c}eskie zametki},
     pages = {19--26},
     publisher = {mathdoc},
     volume = {45},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_45_4_a2/}
}