1. A versatile computer-controlled assembly system;Ambler;Proc. of Third Intern. Joint Conf. Artificial Intelligence,1973
2. Algorithm 457: finding all the cliques of an undirected graph;Bron;C.A.C.M.,1973
3. Cliques of a graph — large or small;Johnston,1974
4. Reducibility among combinatorial problems;Karp,1972