@article{TIMM_2015_21_4_a14,
     author = {D. O. Zykov},
     title = {Coefficients of trigonometric polynomials under a one-sided constraint},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {152--160},
     year = {2015},
     volume = {21},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2015_21_4_a14/}
}