Serna, A., Pätsch, J., Dähnke, K., Wiesner, M. G., Christian Hass, H., Zeiler, M., et al. (2010).
History of anthropogenic nitrogen input to the German Bight/SE North Sea as reflected by nitrogen isotopes in surface sediments,
sediment cores and hindcast models. Continental Shelf Research, 30(15),
1626-1638. doi:10.1016/j.csr.2010.06.010.