O’Neal, C. L.; Crouch, D. J.; Fatah, A. A. (2000). «Validation of twelve chemical spot tests for the detection of drugs of abuse». Forensic Science International. 109 (3): 189–201. PMID10725655. doi:10.1016/S0379-0738(99)00235-2
O’Neal, C. L.; Crouch, D. J.; Fatah, A. A. (2000). «Validation of twelve chemical spot tests for the detection of drugs of abuse». Forensic Science International. 109 (3): 189–201. PMID10725655. doi:10.1016/S0379-0738(99)00235-2