Michael E. O’Nan: Some evidence for the existence of a new simple group. In: Proceedings of the London Mathematical Society. 3rd Series, Bd. 32, Nr. 3, 1976, ISSN0024-6115, S. 421–479, doi:10.1112/plms/s3-32.3.421.
Michael E. O’Nan: Some evidence for the existence of a new simple group. In: Proceedings of the London Mathematical Society. 3rd Series, Bd. 32, Nr. 3, 1976, ISSN0024-6115, S. 421–479, doi:10.1112/plms/s3-32.3.421.