Jadon, S.P.S. “Spectral Investigations of the Copper Complexes of 3,3’-Dimethoxyl-4,4&Rsquo;-Bisphenyl-Bis(Allyl Thiourea)”. Asian Journal of Chemistry, vol. 16, no. 3, June 2016, pp. 1637-40, https://asianpubs.org/index.php/ajchem/article/view/14470.