http://derickrethans.nl/talks.php

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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/