1. Small solutions of quadratic congruences;Heath-Brown;Glasgow Math. J.,1985
2. S. Lang, “Algebra,” 2nd ed., Addison-Wesley, Reading, MA.
3. Finite fields;Lidl,1983
4. Topics in analytic number theory;Rademacher;Grundlehren Math. Wiss.,1973
5. Equations over finite fields, an elementary approach;Schmidt;Lecture Notes in Math.,1976