Balla Kovács, A. “Studies of the Effects of N Fertilizers and Microbion UNC Biofertilizer on Microelement Content of Horseradish (Armoracia Macrocarpa)”. Acta Agraria Debreceniensis, no. 38, Nov. 2010, pp. 41-45, doi:10.34101/actaagrar/38/2758.