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Inserted 2 paragraphs from German Wikipedia, as suggested in Banner. For now, I've inserted just the text, some formatting (italics). Will add links and references from German Wikipedia subsequently.
Some references in German article point to an older version of a PDF preprint. Cannot reuse them, I guess.
I don't know how to remove the banner hint "This article may be expanded with text translated from the corresponding article in German. (January 2018)" Can someone else do this please?
