1. Alvarez, S., 2012. Biomass Management on Smallholder Crop–Livestock Systems of Highlands of Madagascar: Effects on Farm Sustainability. PhD thesis dissertation, Montpellier SupAgro, France. 224 p (in French).
2. Wheat response to zinc and copper fertilization at Swat;Amin;Pakistan J. Agric. Res.,1992
3. Braun, A.R., Smaling, E.M.M., Muchugu, E.I., Shepherd, K.D., Corbett, J.D., 1997. Maintenance and improvement of soil productivity in the highlands of Ethiopia, Kenya, Madagascar and Uganda., African Highlands Initiative (AHI) Technical Report Series no.6. African Highlands Initiative AHI Coordinating Office, ICRAF, Nairobi, Kenya, 149 p.
4. Influence of no-tillage and organic mulching on tomato (Solanum lycopersicum L.) production and nitrogen use in the mediterranean environment of central Italy;Campiglia;Sci. Hortic.,2011
5. Nutrient balances in African land use systems across different spatial scales: a review of approaches, challenges and progress;Cobo;Agric. Ecosyst. Environ.,2010