1. Zhou Liang, Li Zhi-Yong, Zhu Yu, Li Yun-Tao, Fan Zhong-Cao, Han Wei-Hua, Yu Yu-De and Yu Jin-Zhong, Chin. Phys. B 19, 124214-1 (2010).
2. Yongbo Tang, Daoxin Dai and Sailing He, IEEE Photonics Technol. Lett. 21, 242 (2009).
3. Yongbo Tang, Zhechao Wang, Lech Wosinski, Urban Westergren and Sailing He, J. Opt. Lett. 35, 1290 (2010).
4. Zhu Yu, Xu Xue-Jun, Li Zhi-Yong, Zhou Liang, Han Wei-Hua, Fan Zhong-Chao, Yu Yu-De and Yu Jin-Zhong, Chin. Phys. B 19, 014219-1 (2010).
5. FENG Xiang-hua, Journal of Optoelectronics·Laser 22, 38 (2011). (in Chinese)