Rules / ReferencesCited key not in any .bib fileThe document cites a key that no .bib file defines; the PDF shows [?] or the key in bold.Fix‸Add the entry with overfull cite <doi | arXiv:id | "title">, or fix the key in \cite{}.Other references rulesBibliography file not foundProject reference cache ignoredReference not found in any indexReference metadata differs from the index recordDOI points to a different workarXiv id points to a different workBibliography outside the project not checkedReference could not be checked automatically