1. China Agricultural University (2009) A rough machining method of helical surfaces of enveloping toroidal worm. China Patent 200910235344
2. Choi YK, Banerjee A (2007) Tool path generation and tolerance analysis for free-form surfaces. Int J Mach Tools Manuf 47(3–4):689–696
3. Dong X (2004) Design and modification of enveloping worm gearing, 1st edn. Mechanical Industry Press, Beijing
4. Li Y, Cao Y (2005) NC machining sumulation system VERICUT, 1st edn. Xian Jiaotong University Press, Xian
5. Lin H, Yan J (2005) CNC machining technology, 1st edn. Tsing Hua University Press, Beijing