1. Gauss and Jacobi Sums;Berndt,1998
2. Note on a problem of Chowla;Birch;Acta Arith.,1959
3. Residuacity properties of real quadratic units;Brandler;J. Number Theory,1973
4. An Introduction to the Theory of Numbers;Hardy,1981
5. A Classical Introduction to Modern Number Theory;Ireland,1982