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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., Leibundgut, C., Schwarz, U., & Schick, A. P. (1995). Channel infiltration study using dye tracers. IAHS Publications-Series of Proceedings and Reports-Intern Assoc Hydrological Sciences, 232, 429–436.
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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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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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Zagana, E., Külls, C., & Udluft, P. (2000). Der Wasserhaushalt des Aliakmonas. Vom Wasser, 94, 29–39.
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