Medina, J. R., GarcÍaC. A., M. Hurtado, and DomÍnguez-ramÍrezA. M. “SIMULTANEOUS DETERMINATION OF KETOPROFEN AND ACETAMINOPHEN IN FIXED-DOSE COMBINATION FORMULATIONS BY FIRST-ORDER DERIVATIVE SPECTROSCOPY: APPLICATION TO DISSOLUTION STUDIES”. International Journal of Pharmacy and Pharmaceutical Sciences, Vol. 8, no. 2, Feb. 2016, pp. 244-8, https://innovareacademics.in/journals/index.php/ijpps/article/view/10044.