Venkateswar Rao, P., K. Ashwini, and Kaneez Fatima. 2010. “Synthesis and Spectral Studies on Transition Metal Complexes Derived from a Physiologically Active Macrocyclic Ligand”. Asian Journal of Chemistry 18 (1):469-74. https://asianpubs.org/index.php/ajchem/article/view/21353.