Huy, B.V., Tùng, T.Q. and Đăng Giao, L.V. 2017. DETERMINATION OF NICOTINE IN TOBACCO WORKER’S URINE USING LIQUID-LIQUID EXTRACTION AND GAS CHROMATOGRAPHY-MASS SPECTROMETRY (GC-MS). Hue University Journal of Science: Natural Science. 126, 1A (Jul. 2017), 141-149. DOI:https://doi.org/10.26459/hueuni-jns.v126i1A.4329.