J. Lin, E. Keogh, S. Lonardi, and B. Chiu. Proceedings of the 8th ACM SIGMOD Workshop on Research Issues in Data Mining and Knowledge Discovery, page 2--11. New York, NY, USA, ACM, (2003)
I. Daubechies. CBMS-NSF Regional Conference Series in Applied Mathematics Society for Industrial and Applied Mathematics, Philadelphia, Pennsylvania, (1992)