How open are hybrid journals in transformative agreements? You can analyse progress made over time by open license, publisher and country. You can also monitor the availability of publisher-provided metadata in Crossref.
M. Brodbeck, N. Grünfelder, F. Bertrand, and T. Ricken. Special Issue: 95th Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), 25, 4, page e70045. Wiley-VCH, (2025)
