Szabó, András, Péter Pepó, and László Zsombik. “The Effect of Plant Density on the Yield of Sunflower Hybrid’s in 2001-2002”. Acta Agraria Debreceniensis, no. 10 (May 11, 2003): 184–189. Accessed May 2, 2024. https://ojs.lib.unideb.hu/actaagrar/article/view/3492.