A. Niemunis, “The Effect of the Poisson Ratio on the Yield Function in Plane Strain Condition”, Eng. Trans., vol. 36, no. 4, pp. 629–643, Dec. 1988, Accessed: Jun. 11, 2025. [Online]. Available: https://et3.ippt.pan.pl/index.php/et/article/view/1738