Smallholder system innovations in integrated watershed management (SSI): strategies of water for food and environmental security in drought-prone tropical and subtropical agro-ecosystems - Bhatt, Yogesh; Bossio, Deborah A.; Enfors, E.; Gordon, L.; Kongo, V.; Kosgei, J. R.; Makurira, H.; Masuki, K.; Mul, Marloes L.; Tumbo, S.D. (International Water Management Institute, 2006)