Submitted on: 30 November 1999.
Revised on: 11 January 2000.
Accepted on: 22 January 2000.
___________________Joule---CELL PRESS
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Submitted on: 01 August 2016.
Revised on: 29 September 2016.
Accepted on: 18 November 2016.
___________________Joule---CELL PRESS