Jaleel Saheb, D., et al. “Simultaneous Determination of Diclofenac Sodium and Chlorzoxazone from Combined Dosage Forms by Absorbance Difference Method”. Asian Journal of Chemistry, vol. 16, no. 3, June 2016, pp. 1901-4, https://asianpubs.org/index.php/ajchem/article/view/14432.