1. AFRICOVER (1995) AFRICOVER project of United-Nations Food and Agriculture Organization.
http://www.africover.org/
. Accessed on May 2010
2. Di Gregorio A, Jansen L (2000) Land cover classification system (LCCS). Classification concepts and user manual. FAO, Rome
3. FAO (2009) The state of food insecurity in the world. Economic crises, impacts and lessons learned. FAO, Rome
4. Frere M, Popov G (1979) Agrometeorological crop monitoring and forecasting. FAO Plant Production and Protection Paper No. 17. FAO, Rome
5. Genovese G, Vignolles C, Negre T et al (2001) A methodology for a combined use of Normalized Difference Vegetation Index and CORINE land cover data for crop yield monitoring and forecasting. A case study on Spain. Agronomie 21:91–111