Đoàn, Đặng Văn, Đỗ Quang Huy, Nguyễn Đức Huệ, and Trần Mạnh Trí. 2012. “DETERMINATION OF METHAMPHETAMINE IN URINE SAMPLES BY GC-MS METHOD USING SOLID PHASE EXTRACTION (SPE)”. Vietnam Journal of Science and Technology 48 (5). Hanoi, VN. https://doi.org/10.15625/0866-708X/48/5/1196.