Acknowledgement
Supported by : Faculty Research Grant of Hanyang University
References
- Bull. Amer. Math. Soci. v.5 The Determination of Gauss sums Berndt, B.C.;Evans, R.J.
- Amer. J. Math. v.57 Cyclotomy, higher congruences, and Waring's problem Dickson, L.E.
- Duke Math. J. v.18 The quintic character of 2 and 3 Lehmer, E.
- Finite Fields, Encyclopedia Math. Appl. 20 Lidl, L.;Niederreiter, H.