Submitted on: 11 January 2013.
Revised on: 13 March 2013.
Accepted on: 18 April 2013.
___________________Construction Innovation-England
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Submitted on: 09 April 2004.
Revised on: 23 June 2004.
Accepted on: 24 July 2004.
___________________Construction Innovation-England
Submitted on: 28 November 1999.
Revised on: 11 February 2000.
Accepted on: 29 March 2000.
___________________Construction Innovation-England
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