@article{IM_1983__71_142990,
     author = {D. Goldfeld and P. Sarnak},
     title = {Sums of {Kloosterman} {Sums.}},
     journal = {Inventiones mathematicae},
     pages = {243--250},
     publisher = {mathdoc},
     volume = {71},
     year = {1983},
     zbl = {0507.10029},
     url = {http://geodesic.mathdoc.fr/item/IM_1983__71_142990/}
}