Friedlander, John B. Max Planck Institute for Mathematics, Max Planck Society;
Shparlinski, Igor E. Max Planck Institute for Mathematics, Max Planck Society;
Banks, W. D., Conflitti, A., Friedlander, J. B., & Shparlinski, I. E. (2004). Exponential sums over Mersenne numbers. Compositio Mathematica, 140, 15-30. doi:10.1112/S0010437X03000022.