%0 Journal Article %A G. Freiman %A H. Halberstam %T On a product of sines %J Acta Arithmetica %D 1987 %P 377-385 %V 49 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-49-4-377-385/ %R 10.4064/aa-49-4-377-385 %G en %F 10_4064_aa_49_4_377_385