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http://wiki.dbpedia.org/projects/dbpedia-lookup
. Accessed 27 July 2017
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http://oaei.ontologymatching.org/
. Accessed 27 July 2017
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http://webdatacommons.org/webtables/goldstandard.html
. Accessed 27 July 2017
4. Wikidata.
http://www.wikidata.org
. Accessed 27 July 2017
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