@article{MZM_1986_39_2_a8,
     author = {A. V. Reztsov},
     title = {Some extremal properties of nonnegative trigonometric polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {245--252},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_2_a8/}
}