Google Scholar has begun flagging gratis papers with green triangles.
I’ve run some tests of my own. It’s true. Google doesn’t come close to marking all the gratis OA resources, but at least it’s marking some. Perhaps the coverage will improve with time. I haven’t found any explanation of the new feature at the site.
Here are some sample searches:
- “citation advantage” (many green triangles)
- “serotonin receptors” (few green triangles)
- “elevated 3, 5-diiodothyronine concentrations” (first item has no green triangle, but one version of the article is flagged “Free from Publisher”)
One little step in the right direction.