I. ALALI, M.; HERING, C.; NEUMANN, A. A Number Theoretic Approach to Sylow r-Subgroups of Classical Groups. Revista Matemática Complutense, v. 18, n. 2, p. 329–338, 27 sep.2005 https://doi.org/10.5209/rev_REMA.2005.v18.n2.16676.