1. Minimal coverings of acyclic database schemata;Ausiello,1984
2. On the desirability of acyclic database schemes;Beeri;J. Assoc. Comput. Mach.,1983
3. Graphs and Hypergraphs;Berge,1973
4. Recognition algorithms and design methodology for acyclic database schemes;D'Atri,1986
5. Answering queries in relational databases;D'Atri,1983