Barberis, Elisabetta, Luisella Celi, and Maria Martin. “Speciation and Bioavailability of Soil Nutrients: Effect on Crop Production and Environment”. Italian Journal of Agronomy 4, no. s1 (April 9, 2009): 23–32. Accessed December 18, 2024. https://www.agronomy.it/agro/article/view/ija.2009.s1.23.