The oligopoly's shift to open access: How the big five academic publishers profit from article processing charges. - Leigh-Ann Butler; Lisa Matthias; Marc-Andre Simard; Philippe Mongeon; Stefanie Haustein (Quant. Sci. Stud., 2023)

An open dataset of article processing charges from six large scholarly publishers (2019-2023). - Leigh-Ann Butler; Madelaine Hare; Nina Schönfelder; Eric Schares; Juan Pablo Alperin; Stefanie Haustein (CoRR, 2024)

Estimating global article processing charges paid to six publishers for open access between 2019 and 2023. - Stefanie Haustein; Eric Schares; Juan Pablo Alperin; Madelaine Hare; Leigh-Ann Butler; Nina Schönfelder (CoRR, 2024)

We need to rethink the way we identify diamond open access journals in quantitative science studies. - Marc-Andre Simard; Leigh-Ann Butler; Juan Pablo Alperin; Stefanie Haustein (Quant. Sci. Stud., 2024)