@article{GFA_1993__3_6_58117,
     author = {J. Bourgain},
     title = {Exponential {Sums} and {Nonlinear} {Schr\"odinger} {Equations.}},
     journal = {Geometric and functional analysis},
     pages = {157--178},
     publisher = {mathdoc},
     volume = {3},
     number = {6},
     year = {1993},
     zbl = {0787.35096},
     url = {http://geodesic.mathdoc.fr/item/GFA_1993__3_6_58117/}
}