Small solutions of cubic equations with prime variables in arithmetic progressions Haigang Zhou, Tianze Wang (2007) Acta Arithmetica
Sur certaines sommes d'exponentielles sur les nombres premiers Étienne Fouvry, Philippe Michel (1998) Annales scientifiques de l'École Normale Supérieure
The major arcs approximation of an exponential sum over primes D. A. Goldston (2000) Acta Arithmetica
Trigonometric sums over primes III Glyn Harman (2003) Journal de théorie des nombres de Bordeaux New bounds are given for the exponential sum ∑ P ≤ p < 2 P e ( α p k ) were k ≥ 5 , p denotes a prime and e ( x ) = exp ( 2 π i x ) .