Kluge, Thomas/Liehr, Stefan/Lux, Alexandra/Moser, Petra/Niemann,
Steffen/Umlauf, Nicole/Urban, Wilhelm (2008): IWRM Concept for the Cuvelai
Basin in Northern Namibia. In: Journal of Physics and Chemistry of the Earth,
Vol. 33, No. 1-2, p 48-55
Hummel, D./Th. Kluge/S. Liehr/M. Hachelaf (2006): Virtual Water Trade.
Documentation of an International Expert Workshop. 3.-4. Juli 2006.
Frankfurt am Main. ISOE-Materialien Soziale Ökologie, Nr. 24 (vwt)