HIGGINS, T.R. Effective Column Length—Tier Buildings. Engineering Journal, [S. l.], v. 1, n. 1, p. 12–15, 1964. DOI: 10.62913/engj.v1i1.6. Disponível em: https://ej.aisc.org/index.php/engj/article/view/6. Acesso em: 12 feb. 2025.