Characterisation of dairy systems supplying the Nairobi milk market: a pilot survey in Kiambu District for the identification of target groups of producers - Staal, Steven J.; Chege, L.; Kenyanjui, M.; Kimari, A.; Lukuyu, Ben A.; Njubi, D.; Owango, M.O.; Tanner, J.C.; Thorpe, W.R.; Wambugu, M. (International Livestock Research Institute, 1997)