Duszek M, Łodygowski T. Тhе Post-Yield Analysis of Rigid Plastic Beams Columns and Frames. Eng. Trans. [Internet]. 1985 Jun. 30 [cited 2026 Jan. 17];33(1-2):173-20. Available from: http://et.ippt.gov.pl/index.php/et/article/view/1841