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\bibitem{Voerkelius_etal2003} Voerkelius, S., K{\"u}lls, 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 Tau{\'a}/CE. In \textit{Global change and regional impacts} (pp. 173--184). Springer, Berlin, Heidelberg.

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