1. Bationo A, Hartemink A, Lungu O, Naimi M, Okoth P, Smailing E, Thiombiano L (2006a) Africa soils: their productivity and profitability of fertilizer use; background paper prepared for the African fertilizer summit, Abuja, Nigeria, 9–13 June 2006
2. Bationo A, Waswa B, Kihara J, Kimetu J (2006b) Nutrient cycling in agroecosystems: advantages in integrated soil fertility management in Sub-saharan Africa: challenges and opportunities, (Springer, edn.), Vol 76/2–3 Nov 2006
3. CILSS/AGRHYMET: Rapport final: Réunion de concertation technique sur les perspectives des productions et bilan céréalier ex-post 2004/2005 et prévisionnel 2005/2006 des pays du CILSS: Nouakchott du 7 au 10 novembre 2005
4. FAO (2002) Land degradation assessment in Drylands. Food and Agriculture Organization of the United Nations, Rome, 18 p
5. FAO (2004) Rapport spécial au Niger, 21 décembre 2004