ftp://ftp.csd.uwo.ca/pub/from_wu/v.huff/
http://www.cs.pdx.edu/~idr/compression/index.html   paper ของ code อื่นนอกจาก huff
http://dogma.net/markn/articles/bwt/bwt.htm
http://www.data-compression.com/download.html - - paper & source - -
http://www.tml.hut.fi/~helger/crypto/link/compression/software.html
http://users.utu.fi/sisasa/oasis/oasis-algo.html