Megn, Qing Cheng. <br/><br/>
High-performance liquid chromatographic determination of morphine and its 3- and 6- glucoronide metabolites by two-step solid-phase extraction / 
Qing Cheng Meng and et al. 
<br/><br/><label>Source: </label>Journal of Chromatography B 742 (1) 2000 " 115-123 0378-4347