@article{10_4064_aa135_4_4,
     author = {Chun-Yen Shen},
     title = {An extension of
 {Bourgain} and {Garaev's} sum-product estimates},
     journal = {Acta Arithmetica},
     pages = {351--356},
     publisher = {mathdoc},
     volume = {135},
     number = {4},
     year = {2008},
     doi = {10.4064/aa135-4-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa135-4-4/}
}