HOANG , Hieu Nghia; VU, Quoc Anh; NGHIEM , Manh Hien. An Approximation of Yield Surface for Doubly Symmetrical Sections of Steel Structures. Periodica Polytechnica Civil Engineering, [S. l.], v. 69, n. 1, p. 321–332, 2025. 10.3311/PPci.36589. Disponível em: https://pp5.omikk.bme.hu/ci/article/view/36589. Acesso em: 28 2025.