@article{MZM_2004_76_5_a13,
     author = {M. E. Changa},
     title = {On {Zeros} of {Real} {Trigonometric} {Sums}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {792--797},
     publisher = {mathdoc},
     volume = {76},
     number = {5},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_5_a13/}
}