Indirect Spectrophotometric Determination of Metformin Via Decolorization Eriochrome Black-T . NTU Journal of Pure Sciences, [S. l.], v. 2, n. 4, p. 35–44, 2023. DOI: 10.56286/ntujps.v2i4.737. Disponível em: https://journals.ntu.edu.iq/index.php/NTU-JPS/article/view/737.. Acesso em: 19 apr. 2025.