A Note on Subgroup Membership Problem for PSL(2,p).

Denis Xavier Charles A Note on Subgroup Membership Problem for PSL(2,p). Electronic Colloquium on Computational Complexity (ECCC) 2001 8 29 db/journals/eccc/eccc8.html#ECCC-TR01-029 http://eccc.hpi-web.de/eccc-reports/2001/TR01-029/index.html