Dávid, István, and László Radócz. “Allelopathic Effect of Italian Cocklebur on Sugar Beet”. Acta Agraria Debreceniensis0, no. 16 (December 6, 2005): 74-77. Accessed September 23, 2020. https://ojs.lib.unideb.hu/actaagrar/article/view/3292.