Khanam, Rehana, Rekha Dashora, and A. Goswami. 2012. “Direct Spectrophotometric Determination of Nickel (II) With P-Methoxyphenylazo-Bis-Acetoxime”. Journal of Advanced Scientific Research 3 (02), 78-81. https://sciensage.info/index.php/JASR/article/view/102.