1. Number 45 in London Mathematical Society Student Texts;P Cameron,1999
2. Crawford, J., Ginsberg, M., Luks, E., Roy, A.: Symmetry-breaking predicates for search problems. In: Proceedings of KR’96, pp. 148–159. Morgan Kaufmann, San Francisco (1996)
3. LNCS;T Fahle,2001
4. LNCS;P Flener,2002
5. LNCS;P Flener,2006