A Station Eight Fan Web Site
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"I'd have to do some research, but I recall both Dark Elves and Dwarves in Norse mythology as two different species."
https://en.wikipedia.org/wiki/Svart%C3%A1lfar
https://en.wikipedia.org/wiki/Ni%C3%B0avellir
That's a start. But I don't use wikipedia as a final source for anything.
I also have no memory what this was in reference to.