G. Chiaro, J. Koseki, and L.I. Nalin De Silva. “A density-and stress-dependent elasto-plastic model for sands subjected to monotonic undrained torsional shear loading”. Geotechnical Engineering Journal of the SEAGS & AGSSEA, vol. 44, no. 2, June 2013, pp. 18-26, doi:10.14456/seagj.2013.26.