Radhakrishnan Namboori, C.G., and G. Krishnan. “Synthesis and Characterization of Iron(III), Manganese(III) and Chromium(III) Complexes With N,N’-Propylene-bis(3-Carboxypropenamide)”. Asian Journal of Chemistry, vol. 16, no. 3, June 2016, pp. 1463-70, https://asianpubs.org/index.php/ajchem/article/view/14379.