G. Wesseler y Brinkman, W.,
«Bridging information gaps between farmers, policy-makers, researchers and development agents : paper presented at the regional conference on agroforestry impacts on livelihoods in Southern Africa : putting research into practice, Aventura Warmbaths, South», vol. no. 8030. Technical Centre for Agriculture and Rural Cooperation (CTA), Wageningen, The Netherlands, p. iv, 41 p. : 1 tab., 2003.