1. The distribution of quadratic residues and non-residues;Burgess;Mathematica,1957
2. A note on character sums for binary quadratic forms;Burgess;J. London Math. Soc.,1968
3. On a question of Davenport and Lewis and new character sum bounds in finite fields;Chang;Duke Math. J.,2008
4. M.-C. Chang, Character sums in Fp2, GAFA, in press
5. S.V. Konyagin, Estimates of character sums in finite fields, Matematicheskie Zametki (in Russian), in press