Submitted on: 25 November 2009.
Revised on: 06 March 2010.
Accepted on: 26 April 2010.
___________________Bautechnik---ERNST & SOHN
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http://reply.papertrans.cn/1/33/3289/3289-33.png
Submitted on: 20 October 2001.
Revised on: 05 February 2002.
Accepted on: 09 March 2002.
___________________Bautechnik---ERNST & SOHN
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Submitted on: 03 January 2003.
Revised on: 08 April 2003.
Accepted on: 28 April 2003.
___________________Bautechnik---ERNST & SOHN