Bounds for automorphic L-functions. H. Iwaniec, W. Duke, J. Frielander (1993) Inventiones mathematicae
Bounds for automorphic L-functions. II. H. Iwaniec, W. Duke, J.B. Firedlander (1994) Inventiones mathematicae
Bounds for modular L-functions in the level aspect Valentin Blomer, Gergely Harcos, Philippe Michel (2007) Annales scientifiques de l'École Normale Supérieure