Balsubhramanian, V., & Karthikeyan, N. (2010). Heterosubstitution Reaction on Coordinated Bivalent Quadridentate Ligands of Nickel(II) and Copper(II). Asian Journal of Chemistry, 12(1), 157–166. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/22899