[1] S. E. Harris, Phys. Today 50, 36 (1997).
[2] P. R. Hemmer, D. P. Katz, J. Donoghue, M. Cronin-Golomb, M. S. Shahriar, and P. Kumar, Opt. Lett. 20, 982 (1995).
[3] Y. Li and M. Xiao, Phys. Rev. A 51, 4959 (1995).
[4] Y. Wu and L. Deng, Phys. Rev. Lett. 93, 143904 (2004).
[5] Y.-P. Zhang, U. Khadka, B. Anderson, and M. Xiao, Phys. Rev. Lett. 102, 013601 (2009).
[6] Y.-P. Zhang, B. Anderson, A. W. Brown, and M. Xiao, Appl. Phys. Lett. 91, 061113 (2007).