Gatta, Giuseppe, Anna Gagliardi, Pietro Soldo, and Massimo Monteleone. “Grasses and Legumes in Mixture: An Energy Intercropping System Intended for Anaerobic Digestion”. Italian Journal of Agronomy 8, no. 1 (March 15, 2013): e7. Accessed January 24, 2020. https://www.agronomy.it/index.php/agro/article/view/ija.2013.e7.