Jakab, Péter. “Changes in the Macro-, Mezo-, and Microelement Contents of Maize Hybrids in Relation to the Level of Nutrient Supply”. Acta Agraria Debreceniensis, no. 10 (May 11, 2003): 126–130. Accessed April 22, 2021. https://ojs.lib.unideb.hu/actaagrar/article/view/3479.