Crow, Raym, Richard Gallagher, and Kamran Naim. "Subscribe to Open: A practical approach for converting subscription journals to open access." Learned Publishing 33.2 (2020).
This paper argues business models behind Open Access approaches must be sustainable over the long term. As author-facing article processing charge payments can represent a barrier for some researchers, this article proposes the Subscribe to Open (S2O) approach as an alternative Open Access model.