1. Abdi AM, Seaquist J, Tenenbaum DE, Eklundh L, Ardö J (2014) The supply and demand of net primary production in the Sahel. Environ Res Lett. doi: 10.1088/1748-9326/9/9/094003
2. Block S (2011) The decline and rise of agricultural productivity in sub-Saharan Africa since 1961. Working paper 16481. Cambridge. http://www.nber.org/papers/w16481.pdf?new_window=1 . Accessed 01.2014
3. Chamberlin A, Jayne TS, Headey D (2014) Scarcity amid abundance? Reassessing the potential for cropland expansion in Africa. Food Policy 48:51–65
4. Charles H, Godfray J (2011) Food for thought. PNAS 50(108):19845–19846
5. Cotula L, Vermeulen S, Leonard R, Keeley J (2009) Land grab or development opportunity? Agricultural investment and international land deals in Africa. IIED, FAO, IFAD, London, Rome