This repository provides a small command-line script that checks BibTeX entries against online bibliographic sources and rewrites a cleaned, normalized BibTeX file.

• Parses BibTeX entries from an input file.
• Uses DOI-first lookup when a DOI is present, whether it appears in an explicit doi field or a DOI URL.
• Looks up entries by title using Crossref, OpenAlex, Semantic Scholar, and OpenReview when venue metadata is incomplete or an arXiv-tagged entry needs to be promoted to its published version.
• Treats arXiv metadata as a fallback only: arXiv-tagged entries are upgraded to a published venue record when one is found, and arXiv is queried only if no published version can be resolved.
• Merges fetched metadata into the existing fields.
• Writes a normalized BibTeX file with a consistent field order.
• Writes separate BibTeX and log files for entries that remain unresolved.
• Supports retrying only previously unresolved entries from a past run.
• Retries transient HTTP failures with configurable timeout, retry count, and backoff settings.

Basic usage:

python check_and_fix_biblio.py \
  --input biblio.bib \
  --output biblio_fixed.bib

Main options:

• --mailto: Email address to include in the Crossref User-Agent header.
• --min-similarity: Minimum title similarity (0-1) required to accept a match.
• --crossref-rows: Number of Crossref results to consider per entry.
• --openalex-rows: Number of OpenAlex results to consider per entry.
• --semantic-scholar-rows: Number of Semantic Scholar results to consider per entry.
• --delay: Delay in seconds between requests to external services.
• --limit: Process only the first N entries (leave the rest unchanged).
• --retry-unresolved: Recheck only the keys listed in a previous unresolved BibTeX file and merge the results into the full output file.
• --unresolved-output: Path for the BibTeX subset of entries that still could not be resolved.
• --unresolved-log: Path for a human-readable log of unresolved entries and failure reasons.
• --http-timeout: Per-request timeout for metadata lookups.
• --http-retries: Number of retries for transient HTTP failures such as 429 and 503.
• --retry-backoff: Base exponential backoff in seconds between retries.

Example with custom settings:

python check_and_fix_biblio.py \
  --input my_refs.bib \
  --output my_refs_checked.bib \
  --mailto you@example.com \
  --min-similarity 0.9 \
  --delay 1.0

Retry only entries that were unresolved in a previous run:

python check_and_fix_biblio.py \
  --input my_refs.bib \
  --output my_refs_checked_retry.bib \
  --retry-unresolved unresolved-bib-entries.bib \
  --unresolved-output unresolved-bib-entries-next.bib \
  --unresolved-log unresolved-bib-entries-next.log \
  --http-timeout 60

• --output contains the full rewritten bibliography.
• --unresolved-output contains only the entries that remain unresolved after the run. This file can be passed back to --retry-unresolved.
• --unresolved-log contains a timestamped summary of unresolved entries, their reasons, and the original BibTeX text.

• Matching is title-based; author/year are not used for disambiguation.
• Entries tagged as arXiv through fields such as journal, eprint, archiveprefix, url, or note are treated as preprints and are upgraded to published metadata when a non-arXiv match is found.
• When a published venue is found for an arXiv preprint, arXiv-specific fields such as eprint, archiveprefix, primaryclass, arXiv URLs, and arXiv notes are removed.
• --retry-unresolved only rechecks keys present in the retry file; all other entries from --input are copied through unchanged.
• Entries are reformatted; original comments and non-entry content are not preserved.
• Output is ASCII-only; non-ASCII characters are stripped.