Gichuki, Simon T.; Hijmans, Robert J., 'Mapping sweet potato in Eastern Africa', ICT Update, vol. 26, Technical Centre for Agricultural and Rural Cooperation, Wageningen, 2005
Simon T. Gichuki and Robert J. Hijmans report on a project that is collecting germplasm samples and local knowledge of sweet potato varieties in Eastern Africa with the help of DIVA-GIS, a free geographic information system (GIS).