This page allows you to find whch wiki pages link to a given page, by providing an interface for the Special:Whatlinkshere page
The What links here facility lists the pages in the WikiLibrary which either link to or embedd a given page. By default, it shows all such pages, but it is possible to filter by namespace. The oldest pages are listed first. This facility works also for a page that does not exist
You can also manually check backlinks with some nifty URL editing.
The address of the What Links Here page is, where xxxxxxx is the name of the page you want to check.
More information can be found on this page from the MediaWiki site.