CT-1993-04: Kwast, Karen L. and van Denneheuvel, Sieger (1993) The Meaning of Duplicates in the Relational Database Model. [Report]
CT-1992-02: Kwast, Karen L. and van Denneheuvel, Sieger (1992) Weak Equivalence: Theory and Applications. [Report]
CT-1991-07: Kwast, Karen L. (1991) The Incomplete Database. [Report]