TODD, T N. The aerodynamics of carved stone balls. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 136, p. 61–74, 2007. DOI: 10.9750/PSAS.136.61.74. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9674. Acesso em: 25 apr. 2024.