Apache Lucene. The Apache Software Foundation 2009.
Apache Lucene [link]Paper  bibtex   
@misc{TheApacheSoftwareFoundation2009,
	title = {Apache {Lucene}},
	url = {http://lucene.apache.org/},
	urldate = {2010-07-24},
	author = {{The Apache Software Foundation}},
	year = {2009},
}

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