[1]
M. J. Raja, J. R. Kavitha, K. P. Kumar, and T. Sivakumar, “Simultaneous determination of azathioprine and its metabolite 6-mercaptopurine in human plasma using solid phase extraction-evaporation and liquid chromatography–positive electrospray tandem mass spectrometry”, Int Curr Pharm J, vol. 1, no. 11, pp. 342–352, Oct. 2012.