Đoàn, Đặng Văn, Đỗ Quang Huy, Nguyễn Đức Huệ, and Trần Mạnh Trí. “DETERMINATION OF METHAMPHETAMINE IN URINE SAMPLES BY GC-MS METHOD USING SOLID PHASE EXTRACTION (SPE)”. <i>Vietnam Journal of Science and Technology</i> 48, no. 5 (June 26, 2012). Accessed January 10, 2026. https://vjs.ac.vn/jst/article/view/1196.