Zsolt Szilvágyi, Péter Hudacsek, and Richard P. Ray. “SOIL SHEAR MODULUS FROM RESONANT COLUMN, TORSIONAL SHEAR AND BENDER ELEMENT TESTS”. GEOMATE Journal, vol. 10, no. 20, Dec. 2016, pp. 1822-7, https://geomatejournal.com/geomate/article/view/1948.