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The [citation needed] at the end of second paragraph has the following inline comment:
I'm not sure why this is unsuitable.
The following are some citations (all taken from lead of the 2019 redefinition of SI base units) that are possible replacements of that [citation needed]: [1] [2] [3] [4] [5]
References
Would any of these do? If you think so, you're free to insert one or more of them in the article's text without waiting for my approval. --RoyGoldsmith (talk) 15:12, 19 November 2018 (UTC)