schema:about connects Wikidata item with Wikipedias, e.g.,
Wikidata Query Service: "SELECT * WHERE { ?page schema:about wd:Q80 }"
The triple is also available directly from the MediaWiki entity:
Thank you! I was looking for "outgoing" links from a wikidata item to their corresponding page, but if I understand correctly links point the other way around (from a schema:Article to a wikibase:Item). I think I've got this. Thanks.