Some mean-value theorems for exponential sums
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 13 (1986) no. 3, p. 473-486 
@article{ASNSP_1986_4_13_3_473_0,
     author = {Bombieri, Enrico and Iwaniec, Henryk},
     title = {Some mean-value theorems for exponential sums},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 13},
     number = {3},
     year = {1986},
     pages = {473-486},
     zbl = {0615.10046},
     mrnumber = {881102},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1986_4_13_3_473_0}
}

Bombieri, E.; Iwaniec, H. Some mean-value theorems for exponential sums. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 13 (1986) no. 3, pp. 473-486. http://www.numdam.org/item/ASNSP_1986_4_13_3_473_0/

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