Dao, D. N., Ton, T. G. and Tran, T. C. (2019) “Design an Experiment Using Passive Sampling Technique for Monitoring Heavy Metals: A case study in Nhue river, Vietnam”, Old Journal, (134A), pp. 69–73. Available at: https://jst.vn/index.php/old/article/view/659 (Accessed: 2 August 2025).