B. Berendt, A. Hotho, and G. Stumme. International Semantic Web Conference, volume 2342 of Lecture Notes in Computer Science, page 264 - 278. Springer Verlag, (2002)
E. Keogh, S. Lonardi, and C. Ratanamahatana. KDD '04: Proceedings of the tenth ACM SIGKDD international conference on Knowledge discovery and data mining, page 206--215. New York, NY, USA, ACM, (2004)