Towards a Categorial Data Model Supporting Structured Objects and Inheritance. - S. Kazem Lellahi; Nicolas Spyratos (East/West Database Workshop, 1990)

An Algebraic semantics for Datalog. - Eugénie Foustoucos; S. Kazem Lellahi; Nicolas Spyratos (JFPLC, 1995)

Object Functional Dependencies and the Semantics of Class Extensions. - S. Kazem Lellahi; Nicolas Spyratos; M'Bayang Thiam (BDA, 1996)

A Calculus for Collections and Aggregates. - S. Kazem Lellahi; Val Tannen (Category Theory and Computer Science, 1997)

An Algebraic Query Language for Object-Oriented Data Models. - S. Kazem Lellahi; Rachid Souah; Nicolas Spyratos (DEXA, 1997)

A Partial Semantics for Object Data Models with Static Binding. - S. Kazem Lellahi; Rachid Souah (Ershov Memorial Conference, 1999)

Modeling Data and Objects: An Algebraic View Point. - S. Kazem Lellahi (Theoretical Aspects of Computer Science, 2000)

Object-Oriented Database as a Dynamic System with Implicit State. - S. Kazem Lellahi; Alexandre V. Zamulin (ADBIS, 2001)

Conceptual Data Modeling: An Algebraic Viewpoint. - S. Kazem Lellahi (Ershov Memorial Conference, 2001)