A. Khalil, A., and S. A. Khattab. “Effect of Cavity on Stress Distribution and Settlement under Foundation”. Al-Rafidain Engineering Journal (AREJ) 17, no. 6 (December 28, 2009): 14–29. Accessed September 7, 2025. https://jamh.uomosul.edu.iq/index.php/arej/article/view/31250.