References
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- Durbin , D. , Arakelian , S. M. and Shen , Y. R. 1981 . Phys. Rev. Lett. , 47 : 1411
- Kubo , H. and Nagata , R. 1983 . J. Opt. Soc. Am. , 73 : 1719 E. Santamato and Y. R. Shen, to appear in the J. Opt. Soc. Am