A. Y. Sianipar, M. Muchlisyam, and S. Morin Sinaga, “APPLICATION AND VALIDATION OF DERIVATIVE SPECTROPHOTOMETRIC FOR DETERMINATION LEVELS OF TERNARY MIXTURES OF PARACETAMOL, PROPYPHENAZONE, AND CAFFEINE IN TABLET DOSAGE FORM”, Asian J Pharm Clin Res, vol. 11, no. 13, pp. 8–11, Apr. 2018.