paper-preflight

Check every reference of a LaTeX paper against real scholarly records before you submit. No LLM guessing, no false accusations.

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Language models invent references, and copy-pasted BibTeX carries wrong years, wrong authors and dead DOIs. paper-preflight reads your .tex and .bib files and asks Crossref, dblp, arXiv, DataCite, PubMed and OpenAlex (and Semantic Scholar, if you have a key; Open Library for books without a DOI; GitHub, PyPI, CRAN, Hugging Face and OpenML for software, models and datasets) about every cited work:

• Does it exist?
• Does it match what you wrote?
• Has it been retracted?
• Has the preprint you cite been published since?

When it cannot tell, it says so instead of guessing.

Status: 0.x releases, on the way to a stable 1.0. False positives are the bugs we most want to hear about: please open an issue.

The repository's demo paper cites eleven works, several of them wrong on purpose. A real run, against the live sources:

$ paper-preflight check examples/demo-paper
paper-preflight 0.8.0 · main.tex · 12 entries, 12 cited keys

error   CIT001 main.tex:31
    Citation key 'nonexistent2023' is not defined in any bibliography file (1 use(s)).
error   REF001 refs.bib:43
    The doi of 'devlin2019bert' (10.1109/cvpr.2016.90) resolves to a different work in Crossref: "Deep Residual Learning for Image Recognition" (He et al., 2016).
error   REF003 refs.bib:66
    'lindqvist2024quantum' was not found in Crossref, dblp and Semantic Scholar, and every source responded. Check that the work exists and that its title is correct.
error   REF004 refs.bib:73
    'wakefield1998ileal' has been retracted (reported by Crossref, OpenAlex). Cite it only if the text discusses the retraction.
error   CIT002 refs.bib:128
    Entry key 'kingma2015adam' is already defined at line 47; BibTeX ignores this one.
warning REF015 refs.bib:31
    'he2015residual' cites a preprint that has been published in CVPR (2016), DOI 10.1109/cvpr.2016.90. Cite the published version and keep the eprint field.
warning CIT004 refs.bib:37
    Entries 'devlin2019bert' and 'he2016deep' look like the same work (same DOI).
warning REF013 refs.bib:51
    'kingma2015adam' gives the year 2016, but dblp records 2014, 2015.
warning REF017 refs.bib:112
    The doi of 'tacl2019example' contains LaTeX escapes: '10.1162/tacl\_a\_00276'. Write it as: 10.1162/tacl_a_00276
info    REF005 refs.bib:73
    'wakefield1998ileal' has a published correction (reported by Crossref).
info    REF090 refs.bib:95
    'zhou2016ml' could not be verified: non-Latin titles are not supported yet; grey literature without an identifier (book, report, software, web page).
info    CIT003 refs.bib:116
    Entry 'lecun1998gradient' is never cited.

References: 7 verified · 1 metadata mismatch · 1 identifier conflict · 1 not found · 1 cannot determine
5 error(s) · 4 warning(s) · 3 info

Each finding is backed by a record (or by every source answering "no"). The correct NeurIPS paper is verified through dblp even though Crossref only holds fake copies of it, the book without an identifier is confirmed by Open Library, and the Chinese one, whose script is not supported yet, is reported as "cannot determine" instead of "not found".

What it catches

Every rule has a page: what it checks, when it can be wrong, and what to do. paper-preflight explain REF003 prints it in the terminal.

How accurate is it?

Four measurements, all against the live sources: hallucinations found in published papers, the bibliographies of real papers, a head-to-head with published tools, and a public benchmark.

On hallucinations that got past peer review

GPTZero published 151 hallucinated references it found in NeurIPS 2025 papers and ICLR 2026 submissions, each confirmed by its staff. Pasted as plain text, as the papers printed them:

• None of them is verified. The 9 left undecided are web pages and blog posts, a workshop no source indexes, real titles given with invented authors where several works share the title, and two references too garbled to search. Each is listed with its reason in evals/results/gptzero.md.
• GPTZero's own tool found these, so they are the hallucinations a search can find; recall on every kind of hallucination is lower (see HALLMARK below).

On real papers

Weeks of arXiv papers (20 each, cs, stat, q-bio, quant-ph and astro-ph), chosen mechanically, each list fixed before the changes it measures, run once, with every warning and error reviewed by hand:

• 0.8.0: one false alarm every two papers (56 references on average), against 132 real problems: 93 cited preprints since published, 17 identifiers written as links, wrong authors or given names in 10 entries (in four, most given names are invented), 6 wrong years, 2 misquoted titles, a wrong venue, a DOI that does not exist and an arXiv ID of another paper. Six false alarms are registries' own writing ('Ueber' for 'Über', a title that lost its '3/4'), three are author fields written by hand ('and 324 others'), one an ITU-R report no source indexes. This week was sampled from before the first one, never used until then, so that 0.8.0 need not wait for next week's papers; checked months after it was written, it may read a little better than a fresh week, which follows as a control.
• 0.7.0: about one false alarm every three papers, against 79 real problems. The false alarms are three articles a registry dates only by their online appearance, a book against its online edition, two symbols a registry writes its own way, and a paper's code offered as its published version; all are fixed in 0.8.0.
• The two weeks before (0.6.0): 1.5, then 0.8. 8 of the first week's 13 false alarms were registries' own errors (a short author list, misspelt names, an HTML entity, a typo, a wrong year); 5 are fixed in 0.6.0.
• One week was over our target of 1.5 (2.4); 11 of its 19 false alarms are fixed in 0.5.2.
• In the first week, one false alarm every two papers (48