@article{JEMS_2015_17_1_a1,
     author = {Valentin Blomer and Djordje Mili\'cevi\'c},
     title = {Kloosterman sums in residue classes},
     journal = {Journal of the European Mathematical Society},
     pages = {51--69},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2015},
     doi = {10.4171/jems/498},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/498/}
}