For that I use the Unpaywall API: https://api.unpaywall.org/v2/10.1097/RHU.0000000000000563?email=unpaywall_00@example.com https://api.unpaywall.org/v2/10.1097

For that I use the Unpaywall API: https://api.unpaywall.org/v2/10.1097/RHU.0000000000000563?email=unpaywall_00@example.com https://api.unpaywall.org/v2/10.1097/RHU.0000000000000563?em... According to them it's closed but I definitely see it as open here: https://journals.lww.com/jclinrheum/fulltext/2017/09000/omega_3_fatty_acids_in_rheumatic_diseases__a.6.aspx https://journals.lww.com/jclinrheum/fulltext/2017/09000/omeg... I'll look to see if I can find another data source for OA papers to add more coverage.