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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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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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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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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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Külls, C., Nunes, A., Köbel-Batista, M., Branquinho, C., Bianconi, N., & Costantini, E. (2014). Integrated use of soil physical and water isotope methods for ecohydrological characterization of desertified areas. In EGU Geophysical Abstracts (15430).
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Külls, C. H., Eichinger, F., Fader, H. J., Leistert, H., Lorenz, G., & Szakacs, E. (2011). New Environmental Analytical Techniques to Monitor Carbon Sequestration. In 1st EAGE Sustainable Earth Sciences (SES) Conference and Exhibition (268).
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Frey, S., Külls, C., & Schlosser, C. (2011). New Hydrological Age-Dating techniques using cosmogenic radionuclides Beryllium-7 and Sodium-22. In Proc. IAEA Conf. Monacco.
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Davila, P., & Külls, C. (2010). Reliability of current CFC data for age dating of water. In EGU Geophysical Abstracts (536).
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