ACKROYD, Michael H. Electronic Spreadsheet Tools for Semi- Rigid Frames. Engineering Journal, [S. l.], v. 27, n. 2, p. 69–78, 1990. DOI: 10.62913/engj.v27i2.546. Disponível em: https://ej.aisc.org/index.php/engj/article/view/546. Acesso em: 12 feb. 2025.