SZEPTYŃSKI P. Yield Criterion Accounting for the Influence of the Third Invariant of Stress Tensor Deviator. Part II. Analysis of Convexity Condition of the Yield Surface. Eng. Trans. [Internet]. 2014 Aug. 30 [cited 2025 Jul. 20];59(4):283–297. Available from: https://et.ippt.pan.pl/index.php/et/article/view/139