Submitted on: 25 June 1999.
Revised on: 12 October 1999.
Accepted on: 22 October 1999.
___________________ADVANCED FUNCTIONAL MATERIALS---WILEY-V C H VERLAG GMBH
Submitted on: 28 March 2004.
Revised on: 25 July 2004.
Accepted on: 18 August 2004.
___________________ADVANCED FUNCTIONAL MATERIALS---WILEY-V C H VERLAG GMBH
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