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Keogh has produced a bunch of interesting work. Toward Parameter Free Data Mining is a gem: https://www.cs.ucr.edu/~eamonn/SIGKDD_2004_long.pdf Of course SAX is also super interesting: https://www.cs.ucr.edu/~eamonn/SAX.pdf

Not only is it great work, it's greatly named work. He's brought such gems to the community as "Experiencing SAX:..." and "Hot SAX", and "Group SAX".

Many thanks for your kind words. I have to confess, it was Jessica Lin who came up with the name "SAX". But I did run with it ;-)