Ferrara, Rossana, Costanza Fiorentino, Nicola Martinelli, Pasquale Garofalo, and Gianfranco Rana. “Comparison of Different Ground-Based NDVI Measurement Methodologies to Evaluate Crop Biophysical Properties”. Italian Journal of Agronomy 5, no. 2 (June 30, 2010): 145-154. Accessed May 20, 2019. https://agronomy.it/index.php/agro/article/view/ija.2010.145.