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Submitted on: 12 May 2009.
Revised on: 21 July 2009.
Accepted on: 02 September 2009.
___________________COMPUTERS AND GEOTECHNICS---ELSEVIER SCI LTD
Submitted on: 22 February 2002.
Revised on: 21 May 2002.
Accepted on: 17 June 2002.
___________________COMPUTERS AND GEOTECHNICS---ELSEVIER SCI LTD