Relational database theory / Paolo Atzeni, Valeria De Antonellis. Atzeni, Paolo, 1957- De Antonellis, Valeria, 1951- Relational databases. QA76.9.D3 A925 1992 005.756 20 ATK Includes bibliographical references (p. 363-375) and index. Redwood City, Calif.: Benjamin/Cummings Pub. Co., c1993. c1993. 1993 Text ix, 389 p. : eng