REFERENCES
- Beidleman , James C. and Robinson , Derek J.S. 1997 . On Finite Groups Satisfying the Permutizer Condition. . J. Algebra , 191 : 686 – 703 .
- Doerk , Klaus and Hawkes , Trevor . 1992 . “ Number 4 in De Gruyter Expositions in Mathematics ” . In Finite Soluble Groups Berlin, New York : Walter de Gruyter .
- The GAP Group, Aachen, St Andrews. GAP -- Groups, Algorithms, and Programming, Version 4.1, 1999. (http://www-gap.dcs.st-and.ac.uk/∼gap).