@article{10_4064_aa136_1_4,
     author = {Ernie Croot and Tomasz Schoen},
     title = {On sumsets and spectral gaps},
     journal = {Acta Arithmetica},
     pages = {47--55},
     publisher = {mathdoc},
     volume = {136},
     number = {1},
     year = {2009},
     doi = {10.4064/aa136-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa136-1-4/}
}