[1] M. Sargent, M. O. Scully, W. E. Lamb. Laser Physics. Canada: Addison-wesley, 1974. 120~127
[2] Feng Zhichao, Cheng Zhi, Xi Bing. Laser Physics. Chengdu: Chengdu Telecommunication University Press, 1988. 376~382 (in Chinese)
[3] Zhu Shiqun. Saturation effects in a two-mode ring laser. Phys. Rev. A, 1994,50(2):1710~1715
[4] Zhou Xiaoping, Gao Weijian, Zhu Shiqu. Saturation effects in a two-mode ring laser with both additive and moltiplicative noise. Phys. Lett. A, 1996,213(1,2):43~48
[5] Wu Dajin, Cao Li, Ke Shengzhi. Bistable kinetic model driven by correlated noises: steady-state analysis. Phys. Rev. E, 1994, 50(4):2496~2502