- Proceedings of the 5th Workshop on NLP and XML: Multi-Dimensional Markup in Natural Language Processing, NLPXML@EACL 2006, Trento, Italy, April 4, 2006. Association for Computational Linguistics 2006
- Peter Siniakov:
Querying XML documents with multi-dimensional markup.
- Christoph Müller:
Representing and Accessing Multi-Level Annotations in MMAX2.
- Ulrich Schäfer:
Middleware for Creating and Combining Multi-dimensional NLP Markup.