Jha, S., Amar Kant Jha, and B.G. Thakur. 2010. “Mixed Ligands Chelates of Ni(II) and Cu(II) With Tridentate and Bidentate Schiff Bases”. Asian Journal of Chemistry 11 (3):957-63. https://asianpubs.org/index.php/ajchem/article/view/23404.