@article{MZM_2004_75_3_a19,
     author = {V. A. Yudin},
     title = {On {Positive} {Values} of {Spherical} {Harmonics} and {Trigonometric} {Polynomials}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {476--480},
     publisher = {mathdoc},
     volume = {75},
     number = {3},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_75_3_a19/}
}