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@article{MAN_1984__268_182908, author = {Edwin Hewitt and Gavin Brown}, title = {A {Class} of {Positive} {Trigonometrie} {Sums.}}, journal = {Mathematische Annalen}, pages = {91--122}, publisher = {mathdoc}, volume = {268}, year = {1984}, zbl = {0522.42001}, url = {http://geodesic.mathdoc.fr/item/MAN_1984__268_182908/} }
Edwin Hewitt; Gavin Brown. A Class of Positive Trigonometrie Sums.. Mathematische Annalen, Tome 268 (1984), pp. 91-122. http://geodesic.mathdoc.fr/item/MAN_1984__268_182908/