S Al-Jawadi, A., عزالدين, F. O. Mohammed, فهمي, I. M. Jaafar, ايمان, C. Davie, and كولن. “The Quantification of the Geological Strength Index (GSI): A Review”. Iraqi National Journal of Earth Science (INJES), vol. 25, no. 2, June 2025, pp. 253-67, https://rjps.uomosul.edu.iq/index.php/injes/article/view/15656.