1. On Character Sums and Primitive Roots;Burgess,1962
2. On Integers All of whose Prime Factors are Small;Halberstam,1970
3. An Introduction to the Theory of Numbers;Hardy,1965
4. The Dispersion Method in Binary Additive Problems;Linnik Yu;American Math. Soc.,1963
5. Numbers with Small Prime Factors and the Least k'th Power Non-Residue;Norton;Memoirs of the American Math. Soc.,1971