At the end of the white paper the very last link has an extra backslash causing it to be broken. It's after "For history of the white paper, see"

The link should be:
https://github.com/ethereum/wiki/blob/old-before-deleting-all-files-go-to-wiki-wiki-instead/old-whitepaper-for-historical-reference.md#historical-sources-of-the-white-paper