Sharma, R.C., et al. “Synthesis and Structural Studies of Co(II), Ni(II), Zn(II) and Cd(II) Metal Complexes of 2-Hydroxy-5- Methyl Benzene-1,3-Bis-(Carbalidine-2-Amino Thiazole) ”. Asian Journal of Chemistry, vol. 14, no. 1, Mar. 2010, pp. 503-5, https://asianpubs.org/index.php/ajchem/article/view/22048.