Exponential sums and additive problems involving square-free numbers
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 28 (1999) no. 4, p. 591-613 
@article{ASNSP_1999_4_28_4_591_0,
     author = {Br\"udern, J\"org and Perelli, Alberto},
     title = {Exponential sums and additive problems involving square-free numbers},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 28},
     number = {4},
     year = {1999},
     pages = {591-613},
     zbl = {1019.11028},
     mrnumber = {1760532},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1999_4_28_4_591_0}
}

Brüdern, Jörg; Perelli, Alberto. Exponential sums and additive problems involving square-free numbers. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 28 (1999) no. 4, pp. 591-613. http://www.numdam.org/item/ASNSP_1999_4_28_4_591_0/

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