1. A. Abele J. P. McCrae P. Buitelaar A. Jentzsch and R. Cyganiak. 2017. The Linked Open Data Cloud. http://lod-cloud.net/.
2. T. Berners-Lee. 2006. Linked Data Design Issues. https://www.w3.org/DesignIssues/ LinkedData.html.
3. T. Berners-Lee. 2018. One Small Step for the Web.... https://medium.com/@timberners_lee/ one-small-step-for-the-web-87f92217d085.
4. A. Bertails E. Prud'hommeaux M. Arenas and J. Sequeda. Sept. 2012. A Direct Mapping of Relational Data to RDF. W3C Recommendation W3C. http://www.w3.org/TR/2012/RECrdb-direct-mapping-20120927/.