MANULLA, Mohnned hamady; ABBAS, Alyaa Khidir. Design and Structural Characterization of Novel Azo-Theophylline as Acid-Base Indicator. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 38, n. 2, p. 266–277, 2025. DOI: 10.30526/38.2.3637. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/3637. Acesso em: 22 apr. 2025.