Submitted on: 08 June 2005.
Revised on: 09 September 2005.
Accepted on: 04 October 2005.
___________________Bauphysik---ERNST & SOHN
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Submitted on: 15 July 2000.
Revised on: 06 November 2000.
Accepted on: 04 January 2001.
___________________Bauphysik---ERNST & SOHN
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