Lokhande, R.S., and N.A. Degwekar. 2010. “Extraction and Spectrophotometric Determination of Copper(II) With 4- Chloroiso Nitrosoacetophenone Semicarbazone”. Asian Journal of Chemistry 11 (1):267-69. https://asianpubs.org/index.php/ajchem/article/view/23261.