Combined household and GIS analysis for smallholder production systems: An application to intensifying smallholder dairy systems in central Kenya - Staal, Steven J.; Kruska, Russell L.; Baltenweck, Isabelle; Kenyanjui, M.; Wokabi, A.; Njubi, D.; Thornton, Philip K.; Thorpe, W.R. (ICASA-CIP-UNALM, 2001)