Rahetlah V B, Salgado P, Andrianarisoa B, Tillard E, Razafindrazaka H, Mézo L Le and Ramalanjaona V L 2014: Relationship between normalized difference vegetation index (NDVI) and forage biomass yield in the Vakinankaratra region, Madagascar. Livestock Research for Rural Development. Volume 26, Article #95. Retrieved , from http://www.lrrd.org/lrrd26/5/rahe26095.html