Generalized logical operators for temporal languages. - Mostafa A. Bassiouni; Mark J. Llewellyn (ICCL, 1988)

Handling Time in Query Languages. - Mostafa A. Bassiouni; Mark J. Llewellyn (SSDBM, 1988)

On the definition and maintenance of database views with time-varying domains. - Mostafa A. Bassiouni; Mark J. Llewellyn (COMPSAC, 1989)

A Relational-Calculus Query Language for Historical Databases. - Mostafa A. Bassiouni; Mark J. Llewellyn (Comput. Lang., 1992)

Time-Based Operators for Relational Algebra Query Languages. - Mostafa A. Bassiouni; Mark J. Llewellyn; Amar Mukherjee (Comput. Lang., 1993)

Design and Implementation of Extended Boolean and Comparison Operators for Time-Oriented Query Languages. - Mostafa A. Bassiouni; Amar Mukherjee; Mark J. Llewellyn (Comput. J., 1994)