1 Y.H. Ahn, D.S. Kim, S.T. Cundiff, and J.M. Shacklette, in (Opt. Soc. America, Long Beach, CA, USA, 2002).
1 Y.H. Ahn, S.. Choe, J.. Woo, D.. Kim, S.T. Cundiff, J.M. Shacklette, and Y.. Lim, Physical Review Letters 89, (2002).