IRVINE, H.M.; BRADFIELD, C.D. A Simple Formula for the Polar Second Moment of Area of a Regular Skew-Symmetric Bolt Group. Engineering Journal, [S. l.], v. 16, n. 3, p. 98–99, 1979. DOI: 10.62913/engj.v16i3.335. Disponível em: https://ej.aisc.org/index.php/engj/article/view/335. Acesso em: 9 oct. 2024.