@article{MZM_2005_77_6_a14,
     author = {V. I. Ivanov and Yu. D. Rudomazina},
     title = {On the {Turan} {Problem} for {Periodic} {Functions} with {Nonnegative} {Fourier} {Coefficients} and {Small} {Support}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {941--945},
     publisher = {mathdoc},
     volume = {77},
     number = {6},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_77_6_a14/}
}