Duszek M, Łodygowski T. Тhе Post-Yield Analysis of Rigid Plastic Beams Columns and Frames. Eng. Trans. [Internet]. 1985 Jun. 30 [cited 2025 Jul. 19];33(1-2):173-20. Available from: https://et.ippt.pan.pl/index.php/et/article/view/1841