Tran, Thanh Le, et al. “Permeability Calculation Based on Grain Size Analysis for Hydrogeological Geotechnical Investigation of Van Cao - Hoa Lac Metro Line”. Journal of Water Resources and Environmental Engineering, no. 97, Dec. 2025, pp. 91-96, https://thuyloi.vojs.vn/index.php/tlmt/article/view/37.