1. On sums involving quadratic characters;Ayoub;J. London Math. Soc.,1967
2. Remarks on the size of L(1, χ);Bateman;Publ. Math. Debrecen,1950
3. On the size of L(1, χ);Elliott;Crelle,1969
4. On a question of Ayoub, Chowla and Walum concerning character sums;Fine;Illinois J. Math.,1970
5. The large sieve;Gallagher;Mathematika,1967