Faster retrieval with a two-pass dynamic-time-warping lower bound.

Daniel Lemire Faster retrieval with a two-pass dynamic-time-warping lower bound. 2169-2180 2009 42 Pattern Recognition 9 http://dx.doi.org/10.1016/j.patcog.2008.11.030 db/journals/pr/pr42.html#Lemire09