Henehan, M., Rae, J. W. B., Foster, G. L., Erez, J., Prentice, K. C., Kucera, M., Bostock, H. C., Martinez-Boti, M. A., Milton, J. A., Wilson, P. A., Marshall, B. J., Elliott, T. (2013): Calibration of the boron isotope proxy in the planktonic foraminifera Globigerinoides ruber for use in palaeo-CO2 reconstruction. - Earth and Planetary Science Letters, 364, 111-122.https://doi.org/10.1016/j.epsl.2012.12.029