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citeguard
Check a citation against Crossref for retraction, correction, or expression-of-concern status before it goes into a paper, summary, or review — catches papers like Wakefield's retracted MMR-autism study, still cited 1,000+ times since its 2010 retraction. No API key required. Detection logic (checked against real Crossref data, not just documentation) is shared identically between a Python CLI/library, this MCP server, and a GitHub Action for CI. `npx -y citeguard-mcp-server`
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See the repository for installation instructions: https://github.com/wedo911/citeguard
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