1. Short history of laser development;Hecht;Opt. Eng.,2010
2. http://www.photonics.com/Article.aspx?AID=42279.
3. http://aml.engineering.columbia.edu/ntm/level1/ch02/html/l1c02s01.html.
4. Gear fundamentals: alternative gear manufacturing;Cooper;Gear Technology Magazine, November/December,1998
5. Advances in lasers materials processing-technology;Lawrence,2010