Mahmood, Layla S, Bothaynah N Shihab, and Thair S Rasheed. “RELATIVELY CANCELLATION MODULES”. Al-Nahrain Journal of Science 13, no. 2 (June 1, 2010): 175–182. Accessed May 22, 2026. https://mail.anjs.edu.iq/index.php/anjs/article/view/1116.