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Submitted on: 07 December 2010.
Revised on: 01 February 2011.
Accepted on: 30 March 2011.
___________________International Journal of Geomechanics
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Submitted on: 21 December 2001.
Revised on: 19 April 2002.
Accepted on: 21 May 2002.
___________________International Journal of Geomechanics
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