Thai, N., P. Thom, and L. Dang. “Effects of Pressure Angle on Uneven Wear of a Tooth Profile of an Elliptical Gear Generated by Ellipse Involute”. Science and Technology Development Journal, Vol. 24, no. 3, Aug. 2021, pp. 2031-43, doi:https://doi.org/10.32508/stdj.v24i3.2537.