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Demuth, S., & Külls, C. (1997). Probability analysis and regional aspects of droughts in southern Germany. Sustainability of Water Resources under Increasing Uncertainty, (240), 97.
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Külls, C. (2011). Rekonstruktion hydrologischer Extreme in der Namibwüste. Berichte der naturforschenden Gesellschaft zu Freiburg im Breisgau, (101), 69–81.
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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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Külls, C. J., & Ritter, M. (2010). Deuterium excess anomaly of precipitation in Svalbard. In American Geophysical Union (Vol. 2010, 51).
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Joseph, J., Külls, C., Arend, M., Schaub, M., Hagedorn, F., Gessler, A., et al. (2019). Application of a laser-based spectrometer for continuous in situ measurements of stable isotopes of soil CO2 in calcareous and acidic soils. Soil, 5(1), 49–62.
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Klock, H., Külls, C., & Udluft, P. (2000). Estimation of relative recharge values for the northern Kalahari catchment, Namibia. Journal of African Earth Sciences, 30(4), 47–48.
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Hamutoko, J., Mapani, B., Ellmies, R., Bittner, A., & Külls, C. (2014). A fingerprinting method for the identification of uranium sources in alluvial aquifers: An example from the Khan and Swakop Rivers, Namibia. Physics and Chemistry of the Earth, Parts A/B/C, 72, 34–42.
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Zagana, E., Külls, C., & Udluft, P. (2000). Der Wasserhaushalt des Aliakmonas. Vom Wasser, 94, 29–39.
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Külls, C., Haering, M., Leistert, H., & Oster, H. Hydrological, physical and chemical constraints for groundwater age dating with CFC and SF6. In G-DAT 2008-Leipzig (29).
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Klock, H., Külls, C., & Udluft, P. (2001). Quantification of Groundwater Recharge-Estimating recharge values using hydrochemical and geological data: A case study from the semiarid Kalahari catchment of northern Namibia. IAHS Publications-Series of Proceedings and Reports-Intern Assoc Hydrological Sciences, 269, 25–32.
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