We have analyzed over 10 million open- and closed-access publications - that's a lot!
Our open-access content includes all articles on PubMed Central that were published within the last 15 years. This also includes many papers that are subject to the National Institute of Health (NIH) Open Access Policy of 2008, which ensures that all publications describing research that was funded by the NIH must be made publicly available in PubMed Central within 12 months of the publication date.
Our closed-access content includes all articles from our publishing partners listed here:
To keep our database current, we are adding new publications from these sources monthly.
If you are a publisher that is interested in our free indexing service please contact us at firstname.lastname@example.org.