no. 2
The distribution of sequences in arithmetic progressions
Séminaire Delange-Pisot-Poitou. Théorie des nombres, Tome 13 (1971-1972) no. 2, Exposé no. 25, 5 p. 
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Halberstam, Heini. The distribution of sequences in arithmetic progressions. Séminaire Delange-Pisot-Poitou. Théorie des nombres, Tome 13 (1971-1972) no. 2, Exposé no. 25, 5 p. http://www.numdam.org/item/SDPP_1971-1972__13_2_A10_0/

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