Thi Duong , H. ., Trinh, H. T., Thang, P. Q., Dung, N. T., & Dien, N. T. (2018). Optimization of ultrasonication extraction for determination of 16 polycyclic aromatic hydrocarbons in air particle. Vietnam Journal of Science and Technology, 56(3), 324–334. https://doi.org/10.15625/2525-2518/56/3/11096