@article{article8c6136e8, title = {One-step liquid-liquid extraction of cocaine from urine samples for gas chromatographic analysis}, author = {Farina, Marcelo and Yonamine, MaurĂ­cio and Silva, Ovandir Alves}, year = {2002}, doi = {10.1016/s0379-0738(02)00124-x}, journal = {Forensic Science International} }