Troubleshooting guide
Not found is a signal to investigate, not a guess.
A missing search result can mean a fabricated citation, but it can also come from a typo, incomplete metadata, an older source or a version difference. Use a repeatable search sequence before making the call.
Reviewed by AICheck Research Team on .
Move from exact to broad
- Check identifiers and punctuation.
- Search title fragments with author names.
- Record what matched and what remains uncertain.
What to try next
1. Clean the citation
Remove line breaks introduced by a PDF, repair obvious OCR spacing and separate adjacent references before searching.
2. Check the identifier
Resolve a DOI, PMID, ISBN or arXiv identifier directly. Look for missing characters and punctuation copied into the identifier.
3. Search title variants
Try the exact title, then a distinctive phrase. Hyphens, subtitles, translated titles and online-first records can change how a title appears.
4. Search by author and year
Use the first author plus a topic term and approximate year. Names may be transliterated, abbreviated or ordered differently across databases.
5. Check the publication type
Books, chapters, reports, theses and conference items may not appear in the same indexes as journal articles.
6. Stop before inventing a correction
If no confident record matches the important fields, label the citation unverified. Do not replace it with a merely similar paper.
Frequently asked questions
Does not found mean the reference is fake?
Not always. Coverage gaps, spelling differences, older records and non-journal sources can all make a real work difficult to locate.
Should I cite the closest result instead?
No. A similar title or author is not evidence that it is the intended source.
How long should I keep searching?
Check the identifier, title, author and source type. If those routes produce no confident match, leave the item unverified and ask for the original source.
Primary sources
Document the uncertainty
Record the searches you tried and the fields that failed to match. That makes later review faster and prevents an unresolved item from becoming trusted by repetition.