SENTHAMIL SELVAN, P., et al. “Simultaneous Estimation of Paracetamol and Valdecoxib in Combined Dosage Forms by RP-HPLC Method”. Asian Journal of Chemistry, vol. 19, no. 2, Mar. 2010, pp. 1011-6, https://asianpubs.org/index.php/ajchem/article/view/20151.