Ehsan, M. Q. “PREPARATION AND CHARACTERISATION OF FIRST Row TRANSITION METAL COMPLEXES WITH QUADRIDENTATE TRIPODAL LIGAND TREN [TREN=TRIS (2-AMINOETHYL) AMINE] ?”. Biological Sciences - PJSIR, vol. 43, no. 5, Oct. 2000, pp. 271-4, https://v2.pjsir.org/index.php/biological-sciences/article/view/2048.