Kristó, István, Kálmán Erdei, and Imre Máté. “Usage of Microbiological Products in the Protection of the Sunflower”. Acta Agraria Debreceniensis0, no. 43 (October 30, 2011): 36-40. Accessed January 24, 2021. https://ojs.lib.unideb.hu/actaagrar/article/view/2634.