In PubMed results, in the default Summary display format, the "Free article" link under a citation indicates that free full text of the article is available (Figure 1).
The "Free article" link opens the citation in Abstract display where users can choose icon links to the full text (Figure 2).
Additional access to other free full text articles (if available) also appears on the search results screen (Figure 3). The "Free Full Text" filter in the upper right narrows the search results to only citations with free full text. Also, free full text articles in PubMed Central are indicated.
TIP: Sometimes articles are no longer on the publisher's website but will still be in PubMed Central.
Information from NLM's FAQ.
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