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Döll, P., Krol, M., Fuhr, D., Gaiser, T., Herfort, J., Höynck, S., et al. (2003). Integrated scenarios of regional development in Ceará and Piauí. In Global Change and Regional Impacts (pp. 19–41). Springer, Berlin, Heidelberg.
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Voerkelius, S., Külls, C., Santiago, M. M. F., Frischkorn, H., dos Santos Semrau, L. A., Heinrichs, G., et al. (2003). Investigations on water management and water quality in Picos/PI and Tauá/CE. In Global change and regional impacts (pp. 173–184). Springer, Berlin, Heidelberg.
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Külls, C., & Schwarz, O. (2000). Grundwasseranreicherung in den Waldbeständen der Teninger Allmend bei Freiburg im Breisgau. In Beiträge zur Physischen Geographie (pp. 67–78). Frankfurt am Main: Werner-F. Bär.
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Leibundgut, C., Maloszewski, P., & Külls, C. (2009). Tracers in Hydrology. John Wiley & Sons, Ltd.
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Külls, C. (2001). Groundwater of the North-Western Kalahari, Namibia: estimation of recharge and quantification of the flow system. Doctoral thesis, Hydrogeologie und Umwelt, .
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Rehm-Berbenni, C., Druta A., Åberg, G., Neguer J., Külls, C., Patrizi, G., et al. (2005). Isotope Technologies Applied to the Analysis of Ancient Roman Mortars.
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Krüger, N., Külls, C., Bruggeman, A., Eliades, M., Christophi, C., Rigas, M., et al. (2020). Groundwater recharge estimates with soil isotope profiles-is there a bias on coarse-grained hillslopes? In EGU General Assembly Conference Abstracts (9840).
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Doulgeris, C., Tziritis, E., Pisinaras, V., Panagopoulos, A., & Külls, C. (2020). Prediction of seawater intrusion to coastal aquifers based on non-dimensional diagrams. In EGU Geophysical Abstracts (4073).
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Gaj, M., Beyer, M., Hamutoko, J., Uugulu, S., Wanke, H., Koeniger, P., et al. (2014). How do soil types affect stable isotope ratios of 2H and 18O under evaporation: A Fingerprint of the Niipele subbasin of the Cuvelai-Etosha basin, Namibia. In EGU Geophysical Abstracts (5890).
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Joseph, J., & Külls, C. (2014). Calibration of 13C and 18O measurements in CO2 using Off-axis Integrated Cavity Output Spectrometer (ICOS). In EGU Geophysical Abstracts (659).
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