HOANG TRUNG HIEN; CHUONG THIET TU; NGUYEN HOAI SON. Modal analysis for three dimensional frame structures element using FEM. Journal of Technical Education Science, [S. l.], v. 8, n. 1, p. 65–72, 2013. Disponível em: https://www.jte.edu.vn/index.php/jte/article/view/683. Acesso em: 7 apr. 2026.