An Trung Nguyen, Thi Cam Ha Nguyen, Tien Thinh Lai, Hoang Giang Nguyen, Ha Vu, and Thanh Long Nguyen. “Developing a Database for Cs-137 Radioactivity Concentration and Assessing Residual Levels in Surface Soils of Quang Ninh, Hai Phong, and Lang Son Provinces”. Vietnam Journal of Science, Technology and Engineering 63, no. 3 (September 15, 2021): 92-96. Accessed July 15, 2026. https://vietnamscience.vjst.vn/index.php/vjste/article/view/73.