I. Alsaif, K., خلیل, H. S. Albadrani, and هدیة. “Hybrid System for Speech Coding Based on Contourlet Transformation”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 10, no. 1, June 2025, pp. 107-1, https://rjps.uomosul.edu.iq/index.php/csmj/article/view/19513.