The record

1. The Retraction Watch database, now published openly by Crossref, lists every known retraction. We keep only full retractions, not corrections.
2. We walk every link to doi.org on English Wikipedia (millions of them) and match each one to that list.
3. For each match we read the article, find the sentence the citation supports, and check the citation and its surroundings for any mention of the retraction.

Zombie or flagged

Zombie means the retracted paper is cited and nothing near it says so. Flagged means the article already warns readers, usually with Wikipedia's Retracted template. A citation on the biography of one of the paper's own authors is listed separately, since it is there to describe their work.

A zombie is not an accusation. Some articles cite a retracted paper to discuss it, and some retractions were for reasons that don't touch the cited claim. A person should read the context before editing. Every entry links to the article and the official notice.

We leave out, by default, reviews withdrawn only because a newer version replaced them (common with Cochrane). Those are outdated, not discredited. One switch in the register brings them back.

Note to editors

A note from Zombie Facts, a free public tracker of retracted research.

The article "{PAGE}" ({SECTION}) cites
  {TITLE}
  https://doi.org/{DOI}
which was retracted on {DATE}: https://doi.org/{NOTICE}

It supports this sentence: "{SAID}"

If the citation is there to discuss the retraction, nothing to do. Otherwise it may need replacing, or marking with {{tl|Retracted}}. ~~~~