A. Theobald, and G. Weikum. Proceedings of the 8th International Conference on Extending Database Technology, volume 2287 of Lecture Notes in Computer Science, page 477-495. Springer-Verlag, (2002)
M. Theobald, R. Schenkel, and G. Weikum. Intelligent Search on XML Data, volume 2818 of Lecture Notes in Computer Science, page 145-157. Springer, (2003)
M. Theobald, R. Schenkel, and G. Weikum. SIGIR '05: Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, page 242--249. New York, NY, USA, ACM, (2005)