Hain, M. P., Sigman, D. M., Higgins, J. A., & Haug, G. H. (2015). The effects of secular calcium and magnesium concentration changes on the thermodynamics of seawater acid/base chemistry: Implications for Eocene and Cretaceous ocean carbon chemistry and buffering. Global Biogeochemical Cycles, 29(5), 517–533. Portico. https://doi.org/10.1002/2014gb004986