SPRING, K. C. F.; BUTCHER, G. W. Introduction and philosophy. Bulletin of the New Zealand Society for Earthquake Engineering, [S. l.], v. 18, n. 4, p. 323–328, 1985. DOI: 10.5459/bnzsee.18.4.323-328. Disponível em: https://bulletin.nzsee.org.nz/article/view/853. Acesso em: 7 may. 2026.