Survey of methods to determine the plastic limit of soil based on penetration depth and water content in fall cone test - Văn, Ngọc Thành; Huỳnh, Đức Luân; Lê, Minh Sơn; Kiều Lê, Thủy Chung; Ngô, Tấn Phong (VNUHCM Journal of Engineering and Technology, 2024)