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Submitted on: 27 March 1998.
Revised on: 04 May 1998.
Accepted on: 21 May 1998.
___________________INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
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Submitted on: 19 December 2008.
Revised on: 11 February 2009.
Accepted on: 26 February 2009.
___________________INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS