On the Expressiveness of First-Order Constraint Languages. - Foto N. Afrati; Theodoros Andronikos; Theodoros G. Kavalieros (CDB, 1995)

Answering Queries Using Materialized Views with Disjunctions. - Foto N. Afrati; Manolis Gergatsoulis; Theodoros G. Kavalieros (ICDT, 1999)