1 F.-L.. Hong, J.. Ishikawa, T.H. Yoon, L.-S.. Ma, J.. Ye, and J.L. Hall, in Unknown (SPIE, San Diego, CA, 1998).
1 J.. Ye, T.H. Yoon, J.L. Hall, A.. Madej, J.. Bernard, K.J. Siemsen, L.. Marmet, J.-M.. Chartier, and A.. Chartier, Physical Review Letters 85, (2000).