1. Finite Groups;Gorenstein,1968
2. On a parabolic system of type M24;Heiss;J. Algebra,1991
3. A. A. Ivanov, and, S. V. Shpectorov, On geometries with the diagram [formula], preprint, 1989.
4. Geometry of Sporadic Groups. I. Petersen and Tilde Geometries;Ivanov,1999
5. On the minimal parabolic system related to M24;Rowley;J. London Math. Soc.,1989