M. AL-Sheikh, Adnan, and Khaled S. Hameed. “Theoretical Study of Energy Gap for Silicon and Germanium Under High Pressure”. Rafidain Journal of Science 22, no. 3 (April 1, 2011): 58–68. Accessed September 28, 2025. https://jamh.uomosul.edu.iq/index.php/rsci/article/view/47412.