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Submitted on: 30 July 1999.
Revised on: 17 October 1999.
Accepted on: 11 November 1999.
___________________INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
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Submitted on: 29 April 2007.
Revised on: 14 July 2007.
Accepted on: 04 August 2007.
___________________INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
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