BEDNÁRIK M, KOHÚT I. Out-of-plane principal stress in plane strain/stress failure investigations – an overview of its relevance for various failure criteria. Contrib. Geophys. Geod. [Internet]. 2021 May 6 [cited 2026 Feb. 4];36(4):343-59. Available from: https://journals.savba.sk/index.php/cgg/article/view/5027