DTD-Driven Structure Preserving XML Compression
S. Böttcher, R. Steinmetz, in: Flexible and Efficient Information Handling, 23rd British National Conference on Databases, BNCOD 23, Berlin, Heidelberg, 2006, pp. 266–269.

Finding the Leak: A Privacy Audit System for Sensitive XML Databases
S. Böttcher, R. Steinmetz, in: 22nd International Conference on Data Engineering Workshops (ICDEW’06), IEEE, 2006.

Information Disclosure by XPath Queries
S. Böttcher, R. Steinmetz, in: Secure Data Management, Third VLDB Workshop, SDM 2006, Springer, 2006, pp. 160–174.

Adaptive XML Access Control Based on Query Nesting, Modification and Simplification
S. Böttcher, R. Steinmetz, in: Datenbanksysteme in Business, Technologie Und Web, 11. Fachtagung Des GI-Fachbereichs “Datenbanken Und Informationssysteme” (DBIS), 2005, pp. 295–304.

Embedding XML Schema Constraints in Search-Based Intersection Tests for XPath Query Optimization
S. Böttcher, R. Steinmetz, in: 16th International Workshop on Database and Expert Systems Applications (DEXA’05), IEEE, 2005, pp. 842–846.

Detecting Privacy Violations in Sensitive XML Databases
S. Böttcher, R. Steinmetz, in: Secure Data Management, Second VLDB Workshop, SDM 2005, Springer, 2005, pp. 143–154.

Optimized Internet Search Based on a Intersection Test for XPath Expressions under a DTD
S. Böttcher, R. Steinmetz, in: Proceedings of the International Conference on Internet Computing, IC ’04, 2004, pp. 587–593.

Testing Containment of XPath Expressions in Order to Reduce the Data Transfer to Mobile Clients
S. Böttcher, R. Steinmetz, in: Advances in Databases and Information Systems, 7th East European Conference, ADBIS 2003, Springer, 2003, pp. 400–410.

A DTD Graph Based XPath Query Subsumption Test
S. Böttcher, R. Steinmetz, in: Database and XML Technologies, First International XML Database Symposium, XSym 2003, Berlin, Heidelberg, 2003, pp. 85–99.

A Subset Test for XPath Expressions under DTDs
S. Böttcher, R. Steinmetz, in: 20th British National Conference on Databases, BNCOD 20, Poster Papers, 2003, pp. 43–45.