Jim Shiau, Mathew Sams, Fadhil Al-Asadi, and Mohammad Mirza Hassan. 2017. “STABILITY CHARTS FOR UNSUPPORTED PLANE STRAIN TUNNEL HEADINGS IN HOMOGENEOUS UNDRAINED CLAY”. GEOMATE Journal 14 (41):19-26. https://geomatejournal.com/geomate/article/view/3200.