I. Alsaif, Khalel, خلیل, Yahya Q. Alqathely, یحیى, Nagham T. Chalmeran, and نغم. “Calculate Weights for a Numerical Number Image”. Journal of Education and Science (JES) 24, no. 4 (January 1, 1970): 119–131. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17545.