URLs listed in these notes and references were visited as of March 2024. Please be aware that URLs do change, even though the reference material may still remain online. If a URL listed below is no longer valid, consider searching for the source document based on the principal author’s name, the document title, or the volume, of a periodical in which the document appeared. Another possibility is to use the “Wayback Machine” at www.archive.org and enter the URL as of March 1, 2024, or before.
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