Michail Vlachos Suleyman S. Kozat Philip S. Yu Optimal Distance Bounds on Time-Series Data. 109-120 2009 SDM http://www.siam.org/proceedings/datamining/2009/dm09_011_vlachosm.pdf conf/sdm/2009 db/conf/sdm/sdm2009.html#VlachosKY09