D.Mohammad, Omar. “The Effect Of Center Distance Change On Gear Teeth Engagement And Stress Analysis”. Al-Rafidain Engineering Journal (AREJ) 16, no. 5 (December 28, 2008): 70–81. Accessed September 5, 2025. https://jamh.uomosul.edu.iq/index.php/arej/article/view/30808.