http://derickrethans.nl/talks.php




http://telemat.det.unifi.it/book/2001/wchange/download/stem_porter.html
http://lucene.apache.org/solr/
http://framework.zend.com/manual/en/zend.search.lucene.html
http://snowball.tartarus.org/
http://mecab.sourceforge.net/