Performance of a pentafluorophenylpropyl stationary phase for the electrospray ionization high-performance liquid chromatography–mass spectrometry–mass spectrometry assay of cocaine and its metabolite ecgonine methyl ester in human urine

Author(s):  
S.R Needham ◽  
P.M Jeanville ◽  
P.R Brown ◽  
E.S Estape
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