Cucci, Giovanna, and Giovanni Lacolla. “Effects of Nitrogen, Phosphorus and Potassium Rates on Yield and Quality on Durum Wheat in a Two-Year Rotation”. Italian Journal of Agronomy 2, no. 1 (March 31, 2007): 47-54. Accessed October 27, 2020. https://www.agronomy.it/index.php/agro/article/view/ija.2007.47.