Burján, Z., M. Móré, X. Czakóné Vágó, and Z. Győri. “The Effect of NPK Treatments on the Cu and Fe Content of Winter Wheat (Triticum Aestivum L.)”. Acta Agraria Debreceniensis, no. 52, Mar. 2013, pp. 31-34, doi:10.34101/actaagrar/52/2095.