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Submitted on: 19 September 2004.
Revised on: 13 January 2005.
Accepted on: 26 January 2005.
___________________ACS Photonics---AMER CHEMICAL SOC
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Submitted on: 23 November 2008.
Revised on: 18 February 2009.
Accepted on: 01 April 2009.
___________________ACS Photonics---AMER CHEMICAL SOC