Korkman, Johan, and Pirkko Virta. “The Leaching and Retention of Copper Lignosulphonate, Copper Sulphate and Copper-EDTA in Soil”. Agricultural and Food Science 51, no. 1 (January 1, 1979): 51–58. Accessed May 18, 2024. https://journal.fi/afs/article/view/72018.