1. Ai, B., Glassner, D. S., Knize, R. J., & Partanen, J. P. Appl. Phys. Lett 64, 951–953 (1994).
2. Mitchell, A. G. & Zemansky, M. W. Resonance Radiation and Excited Atoms (Cambridge Univ. Press, 1971).
3. Kleppner, D., Physics Today 47(1), 9–11 (1994).
4. Gibbs, H. M., Optical Bistability: Controlling Light with Light (Academic, Orlando, 1985).
5. Knize, R. J., Opt. Lett. 17, 244–246 (1992).