Spectrophotometric Determination of Paracetamol, Ibuprofen, and Caffeine in Novafen Capsules by Vierordt’s Method and Crammer’s Rule for Dissolving the Trinomial Equations. Samarra Journal of Pure and Applied Science, [S. l.], v. 4, n. 1, p. 33–42, 2022. DOI: 10.54153/sjpas.2022.v4i1.346. Disponível em: https://sjpas.com/index.php/sjpas/article/view/346. Acesso em: 16 apr. 2026.