@article{MZM_1993_54_5_a15,
     author = {A. V. Reztsov},
     title = {Nonnegative trigonometric polynomials with spherical spectrum},
     journal = {Matemati\v{c}eskie zametki},
     pages = {149--152},
     publisher = {mathdoc},
     volume = {54},
     number = {5},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_5_a15/}
}