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Submitted on: 05 October 1998.
Revised on: 12 December 1998.
Accepted on: 10 February 1999.
___________________Design Studies---ELSEVIER SCI LTD
Submitted on: 21 May 2004.
Revised on: 08 September 2004.
Accepted on: 27 September 2004.
___________________Design Studies---ELSEVIER SCI LTD
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Submitted on: 26 December 2007.
Revised on: 23 February 2008.
Accepted on: 14 March 2008.
___________________Design Studies---ELSEVIER SCI LTD
Submitted on: 29 October 2004.
Revised on: 09 December 2004.
Accepted on: 18 January 2005.
___________________Design Studies---ELSEVIER SCI LTD
Submitted on: 23 May 2005.
Revised on: 18 August 2005.
Accepted on: 22 September 2005.
___________________Design Studies---ELSEVIER SCI LTD