1. Murakawa M, Nosato H, and Higuchi T, the 6th International Conference on Artificial Evolution, (2003), 129.
2. YANG Li-xia, RAO Jian-zhen, and GAO Yu, Journal of Optoelectronics · Laser, 19 (2008), 381.(in Chinese)
3. http://uk.nuhorizons.com/news/news.asp?newsid=3036 .
4. Saruwateri M, and Nawata K, Applied Optics, 18 (1979), 1847.
5. Elsey J, Law S, and Poladian L, 53 rd Electronic Components and Technology Conference, (2003), 1565.