Spectrophotometric Determination of Paracetamol, Ibuprofen, and Caffeine in Novafen Capsules by Vierordt’s Method and Crammer’s Rule for Dissolving the Trinomial Equations. sjpas [Internet]. 2022 Mar. 31 [cited 2026 Jun. 16];4(1):33-42. Available from: https://sjpas.com/index.php/sjpas/article/view/346