Geodesic
Index Four Simple Groups
Canadian journal of mathematics, Tome 30 (1978) no. 1, pp. 1-21

Voir la notice de l'article provenant de la source Cambridge University Press

An index four simple group is a finite simple group, G, with a self-centralizing Sylow p-subgroup whose normalizer in G has order 4p. In this paper index four simple groups having a non-principal ordinary irreducible character of small degree in the principal p-block are studied. 
Alex, Leo J.; Morrow, Dean C. Index Four Simple Groups. Canadian journal of mathematics, Tome 30 (1978) no. 1, pp. 1-21. doi: 10.4153/CJM-1978-001-x
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