Horn Clauses and Functional Dependencies in Complex-value Databases, Seventeenth Australasian Database Conference (ADC) 2006, Hobart, Tasmania, Australia, 16.01.2006 (Slides pdf-file)

On the Logical Implication of Multivalued Dependencies with Null Values, Twelfth Computing: The Australasian Theory Symposium (CATS), Hobart, Tasmania, Australia, 18.01.2006 (Slides pdf-file)

On Multivalued Dependencies in fixed and undetermined Universes, 4th International Symposium on Foundations of Information and Knowledge Systems (FoIKS), Budapest, Hungary, 17.02.2006 (Slides pdf-file)

Equivalences between Data Dependencies in Nested Databases and Fragments of Propositional Logic, University of Dortmund, Dept of Computer Science, Dortmund, Germany, 02.03.2006 (Slides pdf-file)

Unlocking keys for XML trees, The University of Auckland, Dept of Computer Science, Auckland, New Zealand, 22.06.2006

Unlocking keys for XML trees, The University of Queensland, School of Information Technology and Electrical Engineering, Brisbane, Australia, 31.08.2006

A strongly minimal axiomatisation of multivalued dependencies in incomplete database relations'', 2nd International Workshop on Logical Aspects and Applications of Integrity Constraints, 17th International Conference on Database and Expert Systems Applications (DEXA), Krakow, Poland, 08.09.2006 (Slides pdf-file)

Unlocking keys for XML trees, The National University of Singapore, School of Computing, Dept of Computer Science, Singapore, 19.09.2006