1. Computing in permutation and matrix groups. I. Normal closure, commutator subgroups, series;Butler, Gregory;Math. Comp.,1982
2. Computing normalizers in permutation groups;Butler, Gregory;J. Algorithms,1983
3. Effective computation with group homomorphisms;Butler, Gregory;J. Symbolic Comput.,1985
4. A proof of Holt’s algorithm;Butler, Gregory;J. Symbolic Comput.,1988
5. \bysame, Computing a conditioned pc presentation of a soluble permutation group, TR 392, Basser Department of Computer Science, University of Sydney, 1990.