1. J. van Bon (1993): Some extended generalized hexagons, pp. 395–403 in Finite Geometry and Combinatorics (F. De Clerck et al., eds), LMS Lecture Notes 191, Cambridge University Press, Cambridge.
2. J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker, and R. A. Wilson (1985): ATLAS of Finite Groups, Clarendon Press, Oxford.
3. J. H. Conway, S. P. Norton, and L. H. Soicher (1988): The Bimonster, the group Y555, and the projective plane of order 3, pp. 27–50 in Computers in Algebra (M.C. Tangora, ed.), Marcel Dekker, New York.
4. J. H. Conway and N. J. A. Sloane (1988): Sphere Packings, Lattices and Groups, Springer-Verlag, Berlin Heidelberg New York.
5. H. Cuypers and J.I. Hall (1992): The classification of 3-transposition groups with trivial centre, pp. 121–138 in Groups, Combinatorics and Geometry (M.W. Liebeck and J. Saxl, eds), LMS Lecture Notes 165, Cambridge University Press.