1. D. Benson, Modular representation theory: New trends and methods. Lecture Notes in Mathematics 1081. Springer, Berlin, Heidelberg, New York, Tokyo 1984.
2. M. Bianchi, A. Gillio Berta Mauri, L. Verardi, On Hawkes-Isaacs-Özaydin’s conjecture, preprint 1990.
3. O. Bonten, Clifford-Matrizen, Diplomarbeit Aachen 1988
4. Th. Breuer, Diplomarbeit, Aachen 1990.
5. F. Buekenhout, The geometry of the finite simple groups; in “Buildings and the Geometry of Diagrams”, ed. by L. A. Rosati, pp 1–78. Lecture Notes in Mathematics 1181, Springer, Berlin, Heidelberg, New York, Tokyo 1984.