The State of OA: A large-scale analysis of the prevalence and impact of Open Access articles
Piwowar, H., Priem, J., Larivière, V., Alperin, J.P., Matthias, L., Norlander, B., Farley, A., West, J., Haustein, S. (2018). The State of OA: A large-scale analysis of the prevalence and impact of Open Access articles. PeerJ 6:e4375