Y. Harahap, N. Leony, L. M. C. Silalahi, and R. Andalusia, “SIMULTANEOUS QUANTIFICATION OF TAMOXIFEN AND 4-HYDROXY-N-DESMETHYLTAMOXIFEN LEVELS IN HUMAN PLASMA BY LIQUID CHROMATOGRAPHY-TANDEM MASS SPECTROMETRY: DEVELOPMENT AND APPLICATION IN BREAST CANCER PATIENTS”, Int J App Pharm, vol. 10, no. 1, pp. 370–375, Dec. 2018.