Jha, S., Yadav, S., Jha, S., & Yadav, D. (2010). Gravimetric Estimation of Ni(II) and Cu(II) with Tetradentate Ligands Derived from Substituted o-Hydroxy Ketones. Asian Journal of Chemistry, 12(4), 1212–1120. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/23155