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Submitted on: 08 August 1998.
Revised on: 20 October 1998.
Accepted on: 07 November 1998.
___________________ACS Energy Letters---AMER CHEMICAL SOC
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Submitted on: 01 June 2003.
Revised on: 31 August 2003.
Accepted on: 13 September 2003.
___________________ACS Energy Letters---AMER CHEMICAL SOC
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Submitted on: 09 June 2010.
Revised on: 06 September 2010.
Accepted on: 14 October 2010.
___________________ACS Energy Letters---AMER CHEMICAL SOC
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Submitted on: 11 June 2004.
Revised on: 14 August 2004.
Accepted on: 06 October 2004.
___________________ACS Energy Letters---AMER CHEMICAL SOC