1. A. V. Aho, M. R. Garey, and J. Ullman. The transitive reduction of a directed graph. SIAM Journal on Computing, 1(2):131–137, 1972.
2. Technical report;D. Alberts,1997
3. M. de Berg, M. Overmars, and M. van Kreveld. Finding complete bipartite subgraphs in bipartite graphs. ALCOM: Algorithms Review, Newsletter of the ESPRIT II Basic Research Actions Program Project no. 3075 (ALCOM), 1, 1990.
4. E. C. Harris. Principles of Archaeological Stratigraphy. Academic Press, London, San Diego, 2nd edition, 1989.
5. I. Herzog. Computer-aided harris matrix generation. In E. Harris, editor, Practices of archaeological stratigraphy, pages 201–217, London, 1993.