Submitted on: 26 December 2001.
Revised on: 20 March 2002.
Accepted on: 13 April 2002.
___________________Atmospheric Environment-X---ELSEVIER SCI LTD
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Submitted on: 26 October 2015.
Revised on: 11 February 2016.
Accepted on: 22 February 2016.
___________________Atmospheric Environment-X---ELSEVIER SCI LTD