MEDINA-LÓPEZ, J.R., PACHECO PINEDA, J.G., ROJAS GARFIAS, P.A. and CASTRO CHÁVEZ, N. 2020. DERIVATIVES OF THE RATIO SPECTRA FOR DETERMINATION OF ACETYLSALICYLIC ACID, ACETAMINOPHEN, AND CAFFEINE IN FIXED-DOSE COMBINATION FORMULATIONS: APPLICATION TO DISSOLUTION STUDIES. International Journal of Applied Pharmaceutics. 12, 6 (Nov. 2020), 253–257. DOI:https://doi.org/10.22159/ijap.2020v12i6.39417.