1. Cao Ye, Li Rong-ming and Tong Zheng-rong, Optoelectronics Letters 9, 45 (2013).
2. Cao Ye, Cui Dan-ning and Tong Zheng-rong, Optoelectronics Letters 9, 127 (2013).
3. Li Shuguang, Zhu Xingping and Xue Jianrong, Acta Physica Sinica 62, 1 (2013). (in Chinese)
4. Li Dan, Min Liu and Zhouyi Liao, Chinese Journal of Lasers 39, 106 (2012). (in Chinese)
5. Feng Ruijuan, Lou Shuqin and Lu Wenliang, Infrared and Laser Engineering 43, 1007 (2014). (in Chinese)