1. The parallel complexity of simple chain queries;Afrati,1987
2. Universality of data retrieval languages;Aho,1979
3. Reachability is harder for directed than for undirected graphs;Ajtai,1988
4. Contributions to the theory of logic programming;Apt;Assoc. Comput. Mach.,1982
5. Magic sets and other strange ways to implement logic programs;Bancilhon,1986