Bhajan Singh, Har, Sudersana Kumar, M.R. Nadira Wasi, and Mastada Satake. 2010. “Spectrophotometric Determination of Ni(II) in Industrial Samples After Separation By Adsorption of Its 1,4-Dihydroxyanthra-Quinone Complex on Microcrystalline Naphthalene ”. Asian Journal of Chemistry 3 (3):248-51. https://asianpubs.org/index.php/ajchem/article/view/25235.