Serna, A, Pätsch, J, Dähnke, K, Wiesner, MG, Hass, HC, Zeiler, M, Hebbeln, D and Emeis, KC (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