Ahmed Khalil, Rafid. “Digital Image Compression Enhancement Using Bipolar Backpropagation Neural Networks”. Al-Rafidain Engineering Journal (AREJ) 15, no. 4 (December 1, 2007): 40–52. Accessed November 4, 2025. https://ojs.uomosul.edu.iq/index.php/arej/article/view/30926.