Negative values of cosine sums

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Imre Z. Ruzsa Acta Arithmetica 111 (2004), 179-186 MSC: 11B75, 11L99, 42A05. DOI: 10.4064/aa111-2-6

Imre Z. RuzsaAlfréd Rényi Mathematical Institute
Hungarian Academy of Sciences
Budapest, Pf. 127
H-1364 Hungary
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