1. Diploma thesis: Spiele als Hilfsmittel zu Strukturun tersuchungen bei Graphen und Hypergraphen, Freiburg, 2002, http://www.math.uni-freiburg.de/archiv/diplom/isolde_adler.html
2. Graph Theory, Springer, New York, 1997.
3. Query evaluation via tree-decompositions
4. Hypertree Decompositions and Tractable Queries
5. and Robbers, Marshals, and Guards: Game Theoretic and Logical Characterizations of Hypertree Width, Proceedings of the Twentieth ACM Symposium on Principles of Database Systems, ACM Press, New York, (2001), 21-32.