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by palae 1875 days ago
This paper has some insight:

https://iopscience.iop.org/article/10.1088/1742-6596/753/2/0...

1 comments

I suppose I could have Googled instead of complaining, so thanks for doing the work for me! :) [I like how the first citation is from a 1920's paper (by Betz).]