1. Colin Campbell, George Havas, Stephen Linton, and Edmund Robertson, Symmetric presentations and orthogonal groups, The Atlas of Finite Groups: Ten Years On (Birmingham, 1995), London Math. Soc. Lecture Note Ser., vol. 249, Cambridge Univ. Press, Cambridge, 1998, pp. 1–10.[MR]
  2. Colin M. Campbell, George Havas, Colin Ramsay, and Edmund F. Robertson, Nice efficient presentations for all small simple groups and their covers, LMS J. Comput. Math. 7 (2004), 266–283 (electronic).[MR]
  3. Colin M. Campbell, George Havas, Colin Ramsay, and Edmund F. Robertson, On the efficiency of the simple groups of order less than a million and their covers, Experiment. Math. 16 (2007), no. 3, 347–358.[MR]
  4. Colin M. Campbell, George Havas, and Edmund F. Robertson, Addendum to: "An elementary introduction to coset table methods in computational group theory", Groups—St. Andrews 1981, London Math. Soc. Lecture Note Ser., vol. 71, Cambridge Univ. Press, Cambridge, 2007, pp. 361–364.[MR]