Sphere to Triangle overlap check

Hi,
This is a very old question but I can't seem to find a good answer for it and I've searched the net for quite a while.

I need a precise way of checking if a sphere and a given triangle have _any_ overlap.
Specifically, the case I'm struggling with is when the sphere just overlaps one of the edges.
Also, I need to cater for when the sphere is completely inside the triangle, and vice-versa

Help please? Or a decent internet link would be much appreciated

Cheers
Zaf

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