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> [...] a "references" section -- either at the end of the chapter or the book or the overall article.

So footnotes retain the numbering system (1, 2, 3, etc.) throughout the chapter text, but how would you mark sentences for whom a reference is available?

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I'd probably use numbering for the references, and use the array of symbols* available for footnotes -- given that most pages shouldn't have more than a handful of footnotes, and you can restart your symbol order on each page. That's more difficult on longer-form web content, admittedly.

* See https://en.wikipedia.org/wiki/Note_(typography)#Numbering_an... for a sampling. These can be doubled if necessary -- so , ††, etc.

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