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One thing that evolved on the nLab that I think turned out nicely is that when you link to wikipedia or some other reference, instead of providing a link directly on the page, you create a "stub" on the wiki with the same name and provide the link there.
For example, if you want to link to "Global Warming" on wikipedia from a page "Foo" on Azimuth, you would create a stub Global Warming on the wiki and then provide a link to Wikipedia from there. This way, when someone wants to add content to Global Warming, all Azimuth links point to the correct place.