Libutti, A., M. Mucci, M. Francavilla, and M. Monteleone. “Effect of Biochar Amendment on Nitrate Retention in a Silty Clay Loam Soil”. Italian Journal of Agronomy, vol. 11, no. 4, Aug. 2016, pp. 273-6, doi:10.4081/ija.2016.780.