Open access literature
There are many different repositories used to search for papers directly. A short list of the most well-known ones can be found here, with urls so that these websites can be accessed directly.
Journals
Searching for articles through Google Scholar will find them in well-indexed repositories. The repository versions are usually those deposited by the authors and may include versions prior to peer review. More information on Google Scholar & article searches.
Data from the Unpaywall (https://unpaywall.org/) database of open access journals and repositories is integrated into the MIT Libraries catalog (), which means an open accessversion of an article will appear as an option in search results if one is available.
List of other disciplinary repositories
Browser extensions
You can find open access articles through browser extensions. These tools find legally available manuscript versions as well as final published articles when the journal allows it or the journal is open access.
Enter an article’s URL, DOI, title, or other information on the OA Button website to find free, legal, open access versions. Or install the Chrome or Firefox extension, then click on it from a paywalled article to initiate a search for an open version and, when available, instantly get free access. When free access is not found, the service can contact the author directly to help them make the article available.
Directly search an open, legal database of millions of open access scholarly articles. Or install the Chrome or Firefox extension to connect to open access versions of paywalled articles. Unpaywall data is integrated into the MIT Libraries catalog, as well as Web of Science.
References
https://libraries.mit.edu/scholarly/publishing/find-oa-articles/
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