LUI, Eric M. Closure: A Practical P-Delta Analysis Method for Type FR and PR Frames. Engineering Journal, [S. l.], v. 27, n. 1, p. 34–35, 1990. DOI: 10.62913/engj.v27i1.538. Disponível em: https://ej.aisc.org/index.php/engj/article/view/538. Acesso em: 23 oct. 2024.