Submitted on: 14 May 2013.
Revised on: 29 July 2013.
Accepted on: 20 September 2013.
___________________ANNALEN DER PHYSIK---WILEY-V C H VERLAG GMBH
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Submitted on: 18 February 1999.
Revised on: 11 May 1999.
Accepted on: 27 May 1999.
___________________ANNALEN DER PHYSIK---WILEY-V C H VERLAG GMBH
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Submitted on: 08 October 1998.
Revised on: 28 December 1998.
Accepted on: 18 January 1999.
___________________ANNALEN DER PHYSIK---WILEY-V C H VERLAG GMBH