Analisis O6-Metilguanin dalam darah pasien kanker yang menerima Siklofosfamid pada regimen terapi secara kromatografi cair kinerja ultra tinggi-tandem spektrometri massa = Analysis of O6-Methylguanine in cancer's patients blood during administration of Cyclophosphamide by ultra high performance liquid chromatography tandem mass spectrometry (Fakultas Farmasi Universitas Indonesia, 2013)