EL-AJAILY, M., & EL-SAIED, F. (2010). Synthesis and Characterization of Urea Schiff Base Chelates of Cr(III), Cr(VI), TiO(IV) and Pb(II). Asian Journal of Chemistry, 19(6), 4433–4437. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/19933