Innovation in smallholder farming in Africa: Recent advances and recommendations: Proceedings of the International Workshop on Agricultural Innovation Systems in Africa (AISA), Nairobi, Kenya, 29 - 31 May 2013 - Triomphe, Bernard; Waters-Bayer, Ann; Klerkx, Laurens; Schut, Marc; Cullen, Beth; Kamau, G.; Le Borgne, Ewen (Centre de coopération internationale en recherche agronomique pour le développement, 2014)