Somasekhar, Vanita, and Dannana Gowrisankar. “HPLC Method for the Simultaneous Determination of Paracetamol, Aceclofenac and Tizanidine Hydrochloride”. Asian Journal of Chemistry, vol. 23, no. 4, Dec. 2010, pp. 1651-4, https://asianpubs.org/index.php/ajchem/article/view/10181.