Pfeiffer, H.J.2007-11-131984-04-012007-11-131984IDRC-221ehttp://hdl.handle.net/10625/18436Meeting: International Society for Tropical Root Crops. Africa Branch, Triennial Symposium, 2d, 14-19 Aug. 1983, Douala, CMIn IDL-7377p. 203-205application/pdfenOn-farm trials as a link between research and technology transferBook Chapter