Criação de conhecimento dinâmico para a gestão integrada da fertilidade do solo no ocidente do Quénia
Targeted seed aid and seed-systems interventions: Strengthening small-farmer seed systems in East and Central Africa : Proceedings of a workshop, held in Kampala, Uganda, 21-24 June 2000
Farmers` participatory evaluation of a community-based learning process: "Strengthening folk ecology" for integrated soil fertility management in Western Kenya