Sheikhshoaie, Iran, and S. Jamilladdin Fatemi. “Electronic and Spectroscopic Properties of Some Carbamate Derivatives As Chelating Ligands for Removing Ni2+ Ions from Biological Systems”. Asian Journal of Chemistry, vol. 18, no. 4, Mar. 2010, pp. 2997-03, https://asianpubs.org/index.php/ajchem/article/view/20720.