1. On the distribution of primes in arithmetic progressions “on average”;Barban;Dokl. Akad. Nauk UzSSR,1964
2. Square-free numbers in arithmetic progressions;Croft;Proc. London Math. Soc. (3),1975
3. Primes in arithmetic progressions;Davenport;Michigan Math. J.,1966
4. Corrigendum: “Primes in arithmetic progression”;Davenport;Michigan Math. J.,1968
5. Multiplicative Number Theory;Davenport,1980