@article{MZM_1996_59_4_a13,
     author = {A. S. Belov and S. V. Konyagin},
     title = {An estimate of the constant term of a~nonnegative trigonometric polynomial with integer coefficients},
     journal = {Matemati\v{c}eskie zametki},
     pages = {627--629},
     publisher = {mathdoc},
     volume = {59},
     number = {4},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_4_a13/}
}