1. On character sums and primitive roots;Burgess,1962
2. On character sums and L-series;Burgess,1962
3. On character sums and L-series II;Burgess,1963
4. Character sums and primitive roots in finite fields;Davenport;Rend. Circ. Mat. Palermo (2),1963
5. On the least k-th power non-residue in an algebraic number field;Friedlander,1973