BEDNÁRIK, Martin, and Igor KOHÚT. “Out-of-Plane Principal Stress in Plane strain/Stress Failure Investigations – an Overview of Its Relevance for Various Failure Criteria”. Contributions to Geophysics and Geodesy 36, no. 4 (May 6, 2021): 343-359. Accessed September 1, 2024. https://journal.geo.sav.sk/cgg/article/view/336.