1. X. T. Wu, G.H. Wang, in: Non-circular gears and non-uniform velocity transmission, edited by Machinery Industry Publishing House.
2. K. Hideo, Y. Kazuhiki, H. Teru, in: Simplified synthetic design method of pitch curves based on motion specifications for non-circular gears, edited by Trans. Jpn. Soc. Mech. Eng. Part C, 60(570)(1994), 668-674.
3. Z. M. Liu, H. D. Hou, in: The study of computer-aided analysis system, edited by Machine design, 2000, (3)37-41.
4. Y. Fang, J. M. Shao, in: The elliptic gear tooth profile curve's design and drawing. Machine design and manufacture, 2000, 8(6): 2-5.
5. P.Y. He, L.Q. Ji, etc, in: Solid modeling of elliptic gear by computer-aided, edited by Light Industry Machinery, 2008, 26(4): 49-52.