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Dalton, John and Leung, Tin Cheuk (2013): Dispersion and Distortions in the Trans-Atlantic Slave Trade.
Potgieter, Petrus H. (2010): Water and energy in South Africa – managing scarcity.
Yawson, Robert M. and Yawson, Ivy (2008): Policy options of agricultural biotechnology R&D in Sub-Saharan Africa: key issues and aspects. Published in: University of Minnesota