4Theron HB,Coetzee C.,Sutherland FCW,et al.Selective and sensitive liquid chromatography-tandem mass spectrometry method for the determination of levonorgestrel in human plasma[J].Journal of Chromatography B,2004,813:331-336.
5Berzas Nevado JJ,Rodrguez,Flores G.Casta eda Penalvo.Simultaneous spectrophotometric determination of ethinylestradiol and levonorgestrel by partial least squares and principal component regression multivariate calibration[J].Analytica Chimica Acta,1997,340:257-265.
7Berzas Nevado J J, Rodriguez Flores J, Castaneda Pefialvo G. Simultaneous spectrophotometric determination of ethinylestradiol and levonorgestrel by partial least squares and principal component regression multivariate calibration[J]. Anal Chim Acta, 1997, 340. 257-265.
8Theron H B, Coetzee C, Sutherland F C W, et al. Selective and sensitive liquid chromatography-tandem mass spectrometry method for the determination of levonorgestrel in human plasma[J].Journal of Chromatography B, 2004,813: 331-336.
9Theron HB, Coetzee C, Sutherland FC, et al. Selective and sensitive liquid chromatography-tandem mass spectrometry method for the determination of levonorgestrel in human plasma [ J ]. J Chromatogr B Analyt Technol Biomed Life Sci, 2004,813 ( 1-2 ) : 331-336.
10Berzas Nevado JJ, Rodrguez Flores J, Castaeda Penalvo G. Simultaneous spectrophotometric determination of ethinylestradiol and levonorgestrel by partial least squares and principal component regression multivariate calibration [J]. Anal Chim Acta, 1997, 340 ( 1-3 ) : 257-265.
