1. R. Agrawal and H. V. Jagadish, ?Hybrid transitive closure algorithms,? inProc. 16th VLDB Conf., Brisbane, Australia, 1990, pp. 326?334.
2. R. Agrawal and H. V. Jagadish, ?Multiprocessor transitive closure algorithms,? inProc. Int. Symp. Databases in Parallel and Distributed Syst., Austin, TX, 1988, pp. 56?66.
3. R. Agrawal and H. V. Jagadish, ?Direct algorithms for the transitive closure of database relations,? inProc. 13th Int. Conf. Very Large Databases, San Francisco, CA, September 1987, pp. 255?266.
4. Technical Report;F. Banchilon,1985
5. F. Bancilhon and R. Ramakrishnan, ?An amateur's introduction to recursive query processing strategies,? inProc. 1986 ACM-SIGMOD Conf., Washington, DC, 1986, pp. 16?52.