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Submitted on: 19 April 2012.
Revised on: 20 May 2012.
Accepted on: 13 June 2012.
___________________IRBM---ELSEVIER SCIENCE INC
Submitted on: 14 October 2009.
Revised on: 01 February 2010.
Accepted on: 02 March 2010.
___________________IRBM---ELSEVIER SCIENCE INC
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