"Q: What were the main findings of your study?
A: The most simple result was that Sci-Hub contains 69% of all scholarly articles. We also found that the site preferentially covers articles from closed-access publishers and high-impact journals. [Editor’s Note: A breakdown can be found here.] I think it's interesting that Elsevier and the American Chemical Society had some of the highest coverage and those are the publishers that have sued Sci-Hub. Maybe they realized that basically their entire corpus was in Sci-Hub. There were a lot of journals where Sci-Hub has every single article.
Q: What about the other 31%?
A: Just because an article isn’t in Sci-Hub’s database, that doesn’t mean it can’t get it for you. We estimated that Sci-Hub was able to fulfill requests 99% of the time—that suggests the 31% of articles that aren’t covered by Sci-Hub are things that people really aren’t requesting."
