@article{10_4064_aa_49_4_377_385,
     author = {G. Freiman and H. Halberstam},
     title = {On a product of sines},
     journal = {Acta Arithmetica},
     pages = {377--385},
     publisher = {mathdoc},
     volume = {49},
     number = {4},
     year = {1987},
     doi = {10.4064/aa-49-4-377-385},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-49-4-377-385/}
}