XM, the Expert Model for DNA compression

Minh Duc Cao, Trevor I. Dix, Lloyd Allison, Chris Mears,
'A Simple Statistical Algorithm for Biological Sequence Compression',
IEEE Data Compression Conference (DCC), pp.43-52, 2007 [doi:10.1109/DCC.2007.7].
Minh put the XM software, and some other bioinformatics software, at
XM was at
-- until monash pulled the plug on ftp.csse.monash.edu.au in 2014.
Note, there is a reimplementation ("FuzzyLZ") by Dave Powell of the (different) 'approximate repeats model' (ARM) of DNA [here].

(Also see [lloyd/Bioinformatics/].)