Ali Khalil, Manal, mumtaz M. S. Hussein, and Khalil Ibrahim AL-saif. “Calculation of Phononic Images of Ionic Superlattice Crystals”. Journal of Education and Science 23, no. 1 (March 1, 2010): 152–171. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/edusj/article/view/42196.