LUI, E.M.; SUN, Manqing. Effective Lengths of Uniform and Stepped Crane Columns. Engineering Journal, [S. l.], v. 32, n. 3, p. 98–106, 1995. DOI: 10.62913/engj.v32i3.646. Disponível em: https://ej.aisc.org/index.php/engj/article/view/646. Acesso em: 12 feb. 2025.