Boros, Beáta, and Mihály Sárvári. “The Effect of NPK Fertilization and the Plant Density on Maize Yield and Bioethanol Production”. Acta Agraria Debreceniensis, no. 41 (December 15, 2010): 13–18. Accessed April 10, 2021. https://ojs.lib.unideb.hu/actaagrar/article/view/2673.