Aqeel Ashraf, Muhammad, Mohd. Jamil Maah, and Ismail Yusoff. 2011. “Synthesis, Spectral and Biological Studies of Transition Metal Complexes of 2-(4-Nitrophenylaminocarbonyl)benzoic Acid”. Asian Journal of Chemistry 23 (7):3117-20. https://asianpubs.org/index.php/ajchem/article/view/10553.