Shparlinski, Igor E. Max Planck Institute for Mathematics, Max Planck Society;
Chang_Double characters_oa_2014.pdf (Any fulltext), 207KB
Chang, M.-C., & Shparlinski, I. E. (2014). Double character sums over subgroups and intervals. Bulletin of the Australian Mathematical Society, 90(3), 376-390. doi:10.1017/S0004972714000227.