“ A Study on the Stability of Anhydroecgonine Methyl Ester (crack biomarker), Benzoylecgonine, and Cocaine in Human Urine ”. Archives of Clinical Psychiatry 35, no. supl.1 (January 1, 2008): 17–20. Accessed July 23, 2024. https://periodicos.usp.br/acp/article/view/17176.