Hoang HN, Vu QA, Nghiem MH. An Approximation of Yield Surface for Doubly Symmetrical Sections of Steel Structures. Period. Polytech. Civil Eng. [Internet]. 2025 Jan. 1 [cited 2025 Feb. 2];69(1):321-32. Available from: https://pp.bme.hu/ci/article/view/36589