1. Sloane, N.J.A.: The on-line encyclopedia of integer sequences. http://www.research.att.com/~njas/sequences/Seis.html (2008)
2. Lecture Notes in Artificial Intelligence;A Distler,2008
3. The GAP Group: GAP—Groups, Algorithms, and Programming, version 4.4.10 (2007)
4. Linton, S.: Finding the smallest image of a set. In: ISSAC ’04: Proceedings of the 2004 International Symposium on Symbolic and Algebraic Computation, pp. 229–234. ACM, New York (2004)
5. Gent, I.P., Jefferson, C., Miguel, I.: Minion: a fast scalable constraint solver. In: Brewka, G., Coradeschi, S., Perini, A., Traverso, P. (eds.) ECAI, pp. 98–102. IOS, Amsterdam (2006)