Themis Palpanas Michail Vlachos Eamonn J. Keogh Dimitrios Gunopulos Streaming Time Series Summarization Using User-Defined Amnesic Functions. 992-1006 2008 20 IEEE Trans. Knowl. Data Eng. 7 http://doi.ieeecomputersociety.org/10.1109/TKDE.2007.190737 db/journals/tkde/tkde20.html#PalpanasVKG08