Submitted on: 17 August 2007.
Revised on: 13 September 2007.
Accepted on: 26 September 2007.
___________________ADVANCED MATERIALS---WILEY-V C H VERLAG GMBH
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Submitted on: 31 August 2007.
Revised on: 09 December 2007.
Accepted on: 10 January 2008.
___________________ADVANCED MATERIALS---WILEY-V C H VERLAG GMBH
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