MAHUGIJA, J.; WANDWI, A.; KILULYA, K. Comparison of Centrifugation and Solid Phase Extraction (SPE) Methods of Sample Preparations in Determination of Residues of Drugs of Abuse in Urine. Tanzania Journal of Science, [S. l.], v. 46, n. 3, p. 585–596, 2021. DOI: 10.4314/tjs.v46i3.1. Disponível em: https://tjs.udsm.ac.tz/index.php/tjs/article/view/10. Acesso em: 11 apr. 2025.