1. On Galois extensions of a maximal cyclotomic field;Belyi;Izv. Akad. Nauk SSSR Ser. Mat.,1979
2. Number Theory;Borevich,1966
3. Die Zerlegungmatrizen der Gruppen PSL(2, pf);Burkhardt;J. Algebra,1976
4. Algebraic Number Theory,1967
5. On Hurwitz extensions by PSL2(7);Cohen;Math. Proc. Cambridge Philos. Soc.,1979