1. The GAP Group, GAP—Groups, Algorithms, and Programming, Version 4.3, 2002 (http://www.gap-system.org).
2. D.B. Shmoys, É. Tardos, Computational complexity, in: R.L. Graham, M. Grötschel, L. Lovász (Eds.), Handbook of Combinatorics, Vol. II, Elsevier, Amsterdam, 1995.
3. R.P. Stanley, Enumerative Combinatorics, Vol. 1, Cambridge University Press, Cambridge, 1997.
4. Finite Permutation Groups;Wielandt,1964