N. R. Hmoad and A. A. Abdulkareem, “The Effect of Transmission Ratio and the Number of Teeth on Involute Spur Gear Geometrical Characteristics, Load Sharing Ratio, and Contact Stress”, Eng. Technol. Appl. Sci. Res., vol. 15, no. 4, pp. 24970–24976, Aug. 2025.