Reference neither verified nor added with overfull cite

With references.requireCite, every entry that cannot be verified must have been added with overfull cite: it carries an intact x-overfull = {cite … <hash>} marker and a DOI, eprint or URL. The hash makes edits evident; it is not authentication. Entries the author vouches for carry note = {overfull: author-provided} (added by the author, never by an agent). A hand-written entry that no index confirms may not exist.

Fix

‸Ask the author for a DOI/arXiv id and add it with overfull cite, or remove the \cite. If you wrote this entry yourself, add note = {overfull: author-provided} to it.