Höpker, Sebastian N., Wu, Henry, Lucassen, Friedrich, Sadio, Oumar, Brochier, Timothée, Nuworkpor, Ishmael Y., Kasemann, Simone A., Merschel, Peter and Westphal, Hildegard ORCID: https://orcid.org/0000-0001-7324-6122 (2022) Sr Isotope Ratios (87Sr/86Sr) in Water and Fish Otoliths as Estuarine Salinity Tracers: Case Studies from Three NW African Rivers. Estuaries and Coasts . DOI https://doi.org/10.1007/s12237-021-01041-x.

Höpker, Sebastian N., Wu, Henry C., Müller, Peter, Barusseau, Jean-Paul, Vernet, Robert, Lucassen, Friedrich, Kasemann, Simone A. and Westphal, Hildegard ORCID: https://orcid.org/0000-0001-7324-6122 (2019) Pronounced Northwest African Monsoon Discharge During the Mid- to Late Holocene. Frontiers in Earth Science, 7 . DOI https://doi.org/10.3389/feart.2019.00314.