Van Tien, Nguyen, Nguyen Trong Nghia, Nghiem Thi Ha Lien, Vu Duong, Do Quang Hoa, Duong Chi Dung, Phan Nguyen Nhue, and Nguyen Minh Hue. 2022. “Improvement of SERS Signal Measured by Portable Raman Instrument Using Random Sampling Technique”. <i>Vietnam Journal of Science and Technology</i> 60 (2). Hanoi, VN:237-44. https://doi.org/10.15625/2525-2518/16384.