Wikidata: a free collaborative knowledgebase

@article{Vrandecic2014WikidataAF,
  title={Wikidata: a free collaborative knowledgebase},
  author={Denny Vrandecic and M. Kr{\"o}tzsch},
  journal={Commun. ACM},
  year={2014},
  volume={57},
  pages={78-85}
}
This collaboratively edited knowledgebase provides a common source of data for Wikipedia, and everyone else. 

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