T. Đurić, D. Rakić, J. Pantić, J. Lukić, and S. Ćorluka, “Assessment of Undrained Soil Strength Using the Fall Cone Test and Empirical Modelling”, C. R. Acad. Bulg. Sci., vol. 79, no. 9, pp. 1176–1185, Sep. 2026.