@article{IM2_2014_78_4_a1,
     author = {J. Bourgain and M. Z. Garaev},
     title = {Sumsets of reciprocals in prime fields and multilinear {Kloosterman} sums},
     journal = {Izvestiya. Mathematics },
     pages = {656--707},
     publisher = {mathdoc},
     volume = {78},
     number = {4},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2014_78_4_a1/}
}