S. O. Idowu, “pH-Dependent Molecular Behaviors of a New Potential Color Additive: 4{[6-(1-carboxyethyl)-2-hydroxy -1-naphthyl]diazenyl}-3,5- dinitro Benzoic Acid”, J. Appl. Sol. Chem. Model., vol. 1, no. 2, pp. 105–112, Dec. 2012.