HADI IBRAHIM AL-HELO, Karim. Dynamic Behavior of Machine Foundation on Two-Layer Soil System. Journal of Engineering and Sustainable Development, Baghdad, Iraq, v. 19, n. 1, p. 87–102, 2015. Disponível em: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/688.. Acesso em: 19 apr. 2025.