S. Muthukrishnan Rahul Shah Jeffrey Scott Vitter Mining Deviants in Time Series Data Streams. 41-50 2004 conf/ssdbm/2004 SSDBM http://doi.ieeecomputersociety.org/10.1109/SSDBM.2004.51 db/conf/ssdbm/ssdbm2004.html#MuthukrishnanSV04