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 &Amp; Environmental Engineering, no. 97, Dec. 2025, pp. 91-96, https://dev.vojs.vn/index.php/jwree/article/view/20.