Bengt H. Fellenius. (2020) The Tangent Stiffness Uncertainty in Strain-hardening and Strain-softening Soil. <i>The Geotechnical Engineering Journal of the SEAGS & AGSSEA</i>, <i>51</i>(1), pp 89-93.Bengt H. Fellenius. "The Tangent Stiffness Uncertainty in Strain-hardening and Strain-softening Soil". The Geotechnical Engineering Journal of the SEAGS & AGSSEA 51 (2020):pp 89-93.Bengt H. Fellenius. The Tangent Stiffness Uncertainty in Strain-hardening and Strain-softening Soil. Southeast Asian Geotechnical Society:ม.ป.ท. 2020.