@article{10_1090_S0894_0347_06_00536_4,
     author = {Granville, Andrew and Soundararajan, K.},
     title = {Large character sums: {Pretentious} characters and the {P\'olya-Vinogradov} theorem},
     journal = {Journal of the American Mathematical Society},
     pages = {357--384},
     year = {2007},
     volume = {20},
     number = {2},
     doi = {10.1090/S0894-0347-06-00536-4},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-06-00536-4/}
}