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Submitted on: 23 October 2003.
Revised on: 22 November 2003.
Accepted on: 26 December 2003.
___________________Journal of Infrared Millimeter and Terahertz Waves
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Submitted on: 15 September 2005.
Revised on: 26 November 2005.
Accepted on: 09 December 2005.
___________________Journal of Infrared Millimeter and Terahertz Waves