Wikipedia is a well known crowd-sourced encyclopedia. It has an incredible wealth of knowledge which is often backed up by appropriate citations. Those citations may lead to material listed on RePEc. In fact, Wikipedia is currently the most important referrer to IDEAS (excluding search engines) and there are currently 1516 links to IDEAS and EconPapers, mainly on Wikipedia, and also on a few other projects, like Wikibooks, Wikiversity and Wiktionary. This number is gathered from the 57 languages with the most pages on Wikipedia. Of the 1524, 1363 resolve to author, book, article, chapter, software component or paper pages on IDEAS or EconPapers. The rest are mostly to service portals or to rankings.
The fact that a paper is mentioned in Wikipedia is not unlike a citation. Hence, IDEAS now links back to the appropriate Wikipedia page whenever possible. This can be found on the “lists” subfield on every IDEAS page. And for those curious about the distribution by language for the back-links: English 574, German 165, Spanish 83, Norwegian 48, French 48, Japanese 44, Bulgarian 41, Turkish 36.