Lokhande, R.S., S.V. Poman, and U.R. Kapadi. 2010. “Extractive Spectrophotometric Determination of Cu(II) With 4-Chloron Isonitroso Acetophenone Thiosemicarbazone ”. Asian Journal of Chemistry 13 (3):1122-24. https://asianpubs.org/index.php/ajchem/article/view/22766.