@article{SM_2007_198_12_a5,
     author = {I. D. Shkredov},
     title = {Examples of sets with large trigonometric sums},
     journal = {Sbornik. Mathematics},
     pages = {1805--1838},
     publisher = {mathdoc},
     volume = {198},
     number = {12},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2007_198_12_a5/}
}