1. Digraphs. Theory, Algorithms and Applications;Bang-Jensen,2001
2. Orbits of antichains revisited;Cameron;European Journal of Combinatorics,1995
3. A permutation group determined by an ordered set;Claesen;Discrete Mathematics,2003
4. Loops of clutters;Deza,1989
5. Orbits of antichains in ranked posets;Fon-Der-Flaass;European Journal of Combinatorics,1993