Hassan HA, Salih MH, Alhassani MH. Studying the chromatographic separation of caffeine, theophylline, and theobromine. IJCPE [Internet]. 2025 Jun. 30 [cited 2025 Jul. 3];26(2):143-51. Available from: https://www.ijcpe.uobaghdad.edu.iq/index.php/ijcpe/article/view/1377