Intensification of dairying in the greater Nairobi milk-shed: spatial and household analysis - Baltenweck, Isabelle; Staal, Steven J.; Owango, M.O.; Muriuki, H.; Lukuyu, Ben A.; Gichungu, G.; Kenyanjui, M.; Njubi, D.; Tanner, J.C.; Thorpe, W.R. (International Livestock Research Institute, 1998)